mqtt/docs: Mention removal of user_context in 5.x migration guide
update CN for migration-guides/release-5.x/5.0/protocols.rst
Closes
@@ -177,9 +177,11 @@ Most common configurations are listed below:
- Security related to broker verification in :cpp:member:`esp_mqtt_client_config_t::broker::verification`
- Client username is set in :cpp:member:`esp_mqtt_client_config_t::credentials::username`
+- :cpp:type:`esp_mqtt_client_config_t` no longer supports the ``user_context`` field. Please use :cpp:func:`esp_mqtt_client_register_event` instead for registering an event handler; the last argument ``event_handler_arg`` can be used to pass user context to the handler.
+
ESP-Modbus
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Breaking Changes (Summary)
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