fix(mdns): updated the document to clarify self-querying mechanism

Author: suren-gabrielyan-espressif

docs/mdns/en/index.rst

@@ -39,7 +39,7 @@ Example method to start mDNS for the STA interface and set ``hostname`` and ``de
 mDNS Services
 ^^^^^^^^^^^^^
 
-mDNS can advertise information about network services that your device offers. Each service is defined by a few properties.
+mDNS can advertise information about network services that your device offers. Each service is defined by a few properties. (Please note Self-querying names is not supported in Espressif's mDNS library, a deliberate design choice to simplify implementation, preventing local network pollution and addressing WiFi multicast behavior)
 
     * ``instance_name``: friendly name for your service, like ``Jhon's E{IDF_TARGET_NAME} Web Server``. If not defined, ``default_instance`` will be used.
     * ``service_type``: (required) service type, prepended with underscore. Some common types can be found `here <http://www.dns-sd.org/serviceTypes.html>`_.