Doc: add XML ID attributes to <sectN> and <varlistentry> tags.

This doesn't have any external effect at the moment, but it
will allow adding useful link-discoverability features later.

Brar Piening, reviewed by Karl Pinc.

Discussion: https://postgr.es/m/CAB8KJ=jpuQU9QJe4+RgWENrK5g9jhoysMw2nvTN_esoOU0=a_w@mail.gmail.com

Author: tglsfdc

doc/src/sgml/amcheck.sgml

@@ -52,7 +52,7 @@
   able to infer something of the data itself from such messages.
  </para>
 
- <sect2>
+ <sect2 id="amcheck-functions">
   <title>Functions</title>
 
   <variablelist>
@@ -346,7 +346,7 @@ SET client_min_messages = DEBUG1;
   </variablelist>
  </sect2>
 
- <sect2>
+ <sect2 id="amcheck-optional-heapallindexed-verification">
   <title>Optional <parameter>heapallindexed</parameter> Verification</title>
  <para>
   When the <parameter>heapallindexed</parameter> argument to B-Tree
@@ -387,7 +387,7 @@ SET client_min_messages = DEBUG1;
 
  </sect2>
 
- <sect2>
+ <sect2 id="amcheck-using-amcheck-effectively">
   <title>Using <filename>amcheck</filename> Effectively</title>
 
  <para>
@@ -535,7 +535,7 @@ SET client_min_messages = DEBUG1;
  </para>
 
  </sect2>
- <sect2>
+ <sect2 id="amcheck-repairing-corruption">
   <title>Repairing Corruption</title>
  <para>
   No error concerning corruption raised by <filename>amcheck</filename> should

doc/src/sgml/arch-dev.sgml

@@ -178,7 +178,7 @@
     </itemizedlist>
    </para>
 
-   <sect2>
+   <sect2 id="parser-stage-parser">
     <title>Parser</title>
 
     <para>
@@ -241,7 +241,7 @@
 
    </sect2>
 
-   <sect2>
+   <sect2 id="parser-stage-transformation-process">
      <title>Transformation Process</title>
 
     <para>
@@ -365,7 +365,7 @@
     and plans.
    </para>
 
-   <sect2>
+   <sect2 id="planner-optimizer-generating-possible-plans">
     <title>Generating Possible Plans</title>
 
     <para>

doc/src/sgml/auth-delay.sgml

@@ -21,7 +21,7 @@
   <xref linkend="guc-shared-preload-libraries"/> in <filename>postgresql.conf</filename>.
  </para>
 
- <sect2>
+ <sect2 id="auth-delay-configuration-parameters">
   <title>Configuration Parameters</title>
 
   <variablelist>
@@ -54,7 +54,7 @@ auth_delay.milliseconds = '500'
 </programlisting>
  </sect2>
 
- <sect2>
+ <sect2 id="auth-delay-author">
   <title>Author</title>
 
   <para>

doc/src/sgml/auto-explain.sgml

@@ -32,7 +32,7 @@ LOAD 'auto_explain';
   that.
  </para>
 
- <sect2>
+ <sect2 id="auto-explain-configuration-parameters">
   <title>Configuration Parameters</title>
 
  <para>
@@ -43,7 +43,7 @@ LOAD 'auto_explain';
  </para>
 
   <variablelist>
-   <varlistentry>
+   <varlistentry id="auto-explain-configuration-parameters-log-min-duration">
     <term>
      <varname>auto_explain.log_min_duration</varname> (<type>integer</type>)
      <indexterm>
@@ -63,7 +63,7 @@ LOAD 'auto_explain';
     </listitem>
    </varlistentry>
 
-   <varlistentry>
+   <varlistentry id="auto-explain-configuration-parameters-log-parameter-max-length">
     <term>
      <varname>auto_explain.log_parameter_max_length</varname> (<type>integer</type>)
      <indexterm>
@@ -82,7 +82,7 @@ LOAD 'auto_explain';
     </listitem>
    </varlistentry>
 
-   <varlistentry>
+   <varlistentry id="auto-explain-configuration-parameters-log-analyze">
     <term>
      <varname>auto_explain.log_analyze</varname> (<type>boolean</type>)
      <indexterm>
@@ -108,7 +108,7 @@ LOAD 'auto_explain';
     </listitem>
    </varlistentry>
 
-   <varlistentry>
+   <varlistentry id="auto-explain-configuration-parameters-log-buffers">
     <term>
      <varname>auto_explain.log_buffers</varname> (<type>boolean</type>)
      <indexterm>
@@ -128,7 +128,7 @@ LOAD 'auto_explain';
     </listitem>
    </varlistentry>
 
-   <varlistentry>
+   <varlistentry id="auto-explain-configuration-parameters-log-wal">
     <term>
      <varname>auto_explain.log_wal</varname> (<type>boolean</type>)
      <indexterm>
@@ -148,7 +148,7 @@ LOAD 'auto_explain';
     </listitem>
    </varlistentry>
 
-   <varlistentry>
+   <varlistentry id="auto-explain-configuration-parameters-log-timing">
     <term>
      <varname>auto_explain.log_timing</varname> (<type>boolean</type>)
      <indexterm>
@@ -172,7 +172,7 @@ LOAD 'auto_explain';
     </listitem>
    </varlistentry>
 
-   <varlistentry>
+   <varlistentry id="auto-explain-configuration-parameters-log-triggers">
     <term>
      <varname>auto_explain.log_triggers</varname> (<type>boolean</type>)
      <indexterm>
@@ -191,7 +191,7 @@ LOAD 'auto_explain';
     </listitem>
    </varlistentry>
 
-   <varlistentry>
+   <varlistentry id="auto-explain-configuration-parameters-log-verbose">
     <term>
      <varname>auto_explain.log_verbose</varname> (<type>boolean</type>)
      <indexterm>
@@ -209,7 +209,7 @@ LOAD 'auto_explain';
     </listitem>
    </varlistentry>
 
-   <varlistentry>
+   <varlistentry id="auto-explain-configuration-parameters-log-settings">
     <term>
      <varname>auto_explain.log_settings</varname> (<type>boolean</type>)
      <indexterm>
@@ -227,7 +227,7 @@ LOAD 'auto_explain';
     </listitem>
    </varlistentry>
 
-   <varlistentry>
+   <varlistentry id="auto-explain-configuration-parameters-log-format">
     <term>
      <varname>auto_explain.log_format</varname> (<type>enum</type>)
      <indexterm>
@@ -245,7 +245,7 @@ LOAD 'auto_explain';
     </listitem>
    </varlistentry>
 
-   <varlistentry>
+   <varlistentry id="auto-explain-configuration-parameters-log-level">
     <term>
      <varname>auto_explain.log_level</varname> (<type>enum</type>)
      <indexterm>
@@ -266,7 +266,7 @@ LOAD 'auto_explain';
     </listitem>
    </varlistentry>
 
-   <varlistentry>
+   <varlistentry id="auto-explain-configuration-parameters-log-nested-statements">
     <term>
      <varname>auto_explain.log_nested_statements</varname> (<type>boolean</type>)
      <indexterm>
@@ -283,7 +283,7 @@ LOAD 'auto_explain';
     </listitem>
    </varlistentry>
 
-   <varlistentry>
+   <varlistentry id="auto-explain-configuration-parameters-sample-rate">
     <term>
      <varname>auto_explain.sample_rate</varname> (<type>real</type>)
      <indexterm>
@@ -316,7 +316,7 @@ auto_explain.log_min_duration = '3s'
 </programlisting>
  </sect2>
 
- <sect2>
+ <sect2 id="auto-explain-example">
   <title>Example</title>
 
 <programlisting>
@@ -348,7 +348,7 @@ LOG:  duration: 3.651 ms  plan:
 ]]></screen>
  </sect2>
 
- <sect2>
+ <sect2 id="auto-explain-author">
   <title>Author</title>
 
   <para>

doc/src/sgml/basebackup-to-shell.sgml

@@ -27,7 +27,7 @@
   <xref linkend="guc-local-preload-libraries"/>.
  </para>
 
- <sect2>
+ <sect2 id="basebackup-to-shell-configuration-parameters">
   <title>Configuration Parameters</title>
 
   <variablelist>
@@ -74,7 +74,7 @@
   </variablelist>
  </sect2>
 
- <sect2>
+ <sect2 id="basebackup-to-shell-author">
   <title>Author</title>
 
   <para>

doc/src/sgml/basic-archive.sgml

@@ -21,7 +21,7 @@
   must be enabled.
  </para>
 
- <sect2>
+ <sect2 id="basic-archive-configuration-parameters">
   <title>Configuration Parameters</title>
 
   <variablelist>
@@ -57,7 +57,7 @@ basic_archive.archive_directory = '/path/to/archive/directory'
 </programlisting>
  </sect2>
 
- <sect2>
+ <sect2 id="basic-archive-notes">
   <title>Notes</title>
 
   <para>
@@ -70,7 +70,7 @@ basic_archive.archive_directory = '/path/to/archive/directory'
   </para>
  </sect2>
 
- <sect2>
+ <sect2 id="basic-archive-author">
   <title>Author</title>
 
   <para>

doc/src/sgml/bloom.sgml

@@ -38,7 +38,7 @@
   indexes can also perform inequality and range searches.
  </para>
 
- <sect2>
+ <sect2 id="bloom-parameters">
   <title>Parameters</title>
 
   <para>
@@ -73,7 +73,7 @@
    </variablelist>
  </sect2>
 
- <sect2>
+ <sect2 id="bloom-examples">
   <title>Examples</title>
 
   <para>
@@ -215,7 +215,7 @@ CREATE INDEX
   </para>
  </sect2>
 
- <sect2>
+ <sect2 id="bloom-operator-class-interface">
   <title>Operator Class Interface</title>
 
   <para>
@@ -232,7 +232,7 @@ DEFAULT FOR TYPE text USING bloom AS
 </programlisting>
  </sect2>
 
- <sect2>
+ <sect2 id="bloom-limitations">
   <title>Limitations</title>
   <para>
    <itemizedlist>
@@ -268,7 +268,7 @@ DEFAULT FOR TYPE text USING bloom AS
   </para>
  </sect2>
 
- <sect2>
+ <sect2 id="bloom-authors">
   <title>Authors</title>
 
   <para>

doc/src/sgml/btree-gin.sgml

@@ -38,7 +38,7 @@
   on the current database.
  </para>
 
- <sect2>
+ <sect2 id="btree-gin-example-usage">
   <title>Example Usage</title>
 
 <programlisting>
@@ -51,7 +51,7 @@ SELECT * FROM test WHERE a &lt; 10;
 
  </sect2>
 
- <sect2>
+ <sect2 id="btree-gin-authors">
   <title>Authors</title>
 
   <para>

doc/src/sgml/btree-gist.sgml

@@ -58,7 +58,7 @@
   on the current database.
  </para>
 
- <sect2>
+ <sect2 id="btree-gist-example-usage">
   <title>Example Usage</title>
 
   <para>
@@ -101,7 +101,7 @@ INSERT 0 1
 
  </sect2>
 
- <sect2>
+ <sect2 id="btree-gist-authors">
   <title>Authors</title>
 
   <para>