docs: add three Chat message request endpoints to X Chat API sidebar (#488)

Co-authored-by: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

Author: mintlify[bot]

docs.json

@@ -1082,7 +1082,10 @@
                       "x-api/chat/send-typing-indicator",
                       "x-api/chat/mark-conversation-as-read",
                       "x-api/chat/get-chat-conversation-pinned-messages",
-                      "x-api/chat/delete-a-chat-conversation"
+                      "x-api/chat/delete-a-chat-conversation",
+                      "x-api/chat/get-chat-message-requests",
+                      "x-api/chat/get-chat-message-request",
+                      "x-api/chat/accept-a-chat-message-request"
                     ]
                   },
                   {