Add documentation on CEL export format

docs/api/export.mdx

@@ -22,6 +22,7 @@ function formatQuery(
 - SQL `WHERE` clause
 - Parameterized SQL (with anonymous or named parameters)
 - MongoDB
+- Common Expression Language (CEL)
 
 :::info
 
@@ -168,6 +169,20 @@ Output:
 `{"$and":[{"firstName":{"$eq":"Steve"}},{"lastName":{"$eq":"Vai"}}]}`;
 ```
 
+### Common Expression Language
+
+For Common Expression Language (CEL) output, use the "cel" format.
+
+```ts
+formatQuery(query, 'cel');
+```
+
+Output:
+
+```ts
+`firstName = "Steve" && lastName = "Vai"`;
+```
+
 ## Configuration
 
 An object can be passed as the second argument instead of a string in order to have more detailed control over the output.