chore(docs): Update documentation for messages API (#13744)

Update the documentation for messages API

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

swagger/paths/application/conversation/messages/index.yml

@@ -5,6 +5,17 @@ summary: Get messages
 security:
   - userApiKey: []
 description: List all messages of a conversation
+parameters:
+  - name: after
+    in: query
+    schema:
+      type: integer
+    description: Fetch messages after the message with this ID. Returns up to 100 messages in ascending order.
+  - name: before
+    in: query
+    schema:
+      type: integer
+    description: Fetch messages before the message with this ID. Returns up to 20 messages in ascending order.
 responses:
   '200':
     description: Success