DOCSP-43530: Id field in query results (#3149)

Adds information about ID field representation in query builder results

docs/query-builder.txt

@@ -195,9 +195,10 @@ the value of the ``title`` field is ``"Back to the Future"``:
 
    You can use the ``id`` alias in your queries to represent the
    ``_id`` field in MongoDB documents, as shown in the preceding
-   code. When you run a find operation using the query builder, {+odm-short+}
-   automatically converts between ``id`` and ``_id``. This provides better
-   compatibility with Laravel, as the framework assumes that each record has a
+   code. When you use the query builder to run a find operation, the {+odm-short+}
+   automatically converts between ``_id`` and ``id`` field names. In query results,
+   the ``_id`` field is presented as ``id``. This provides better
+   consistency with Laravel, as the framework assumes that each record has a
    primary key named ``id`` by default.
 
    Because of this behavior, you cannot have two separate ``id`` and ``_id``

docs/upgrade.txt

@@ -115,9 +115,10 @@ This library version introduces the following breaking changes:
   date classes, applying the default timezone.
 
 - ``id`` is an alias for the ``_id`` field in MongoDB documents, and the library
-  automatically converts between ``id`` and ``_id`` when querying data. Because
-  of this behavior, you cannot have two separate ``id`` and ``_id`` fields in your
-  documents.
+  automatically converts between ``id`` and ``_id`` when querying data. The query
+  result object includes an ``id`` field to represent the document's ``_id`` field.
+  Because of this behavior, you cannot have two separate ``id`` and ``_id`` fields
+  in your documents.
 
 - Removes support for the ``$collection`` property. The following code shows
   how to assign a MongoDB collection to a variable in your ``User`` class in