Revert attribute_ids example to use simple format

Keep the description explaining qualified_id format, but revert the
example back to plain attribute IDs since the endpoint accepts both
formats.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hitvardhan-solanki-ai

descriptions/0/api.intercom.io.yaml

@@ -1517,7 +1517,7 @@ paths:
                   description: List of attribute identifiers to include in the export. Requires qualified_id format (e.g., "people.Brand", "standard.conversation_id"). Use the qualified_id returned from the get_datasets response.
                   items:
                     type: string
-                  example: [standard.conversation_id, timestamp.conversation_started_at]
+                  example: [conversation_id, conversation_started_at]
                 start_time:
                   type: integer
                   format: int64