fix(DOC-1853): add batching $ref to aws_s3 output override

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mfernest

docs-data/overrides.json

@@ -2923,6 +2923,7 @@
           },
           {
             "name": "batching",
+            "$ref": "#/definitions/batching",
             "children": [
               {
                 "name": "byte_size",