docs: add RabbitMQ MQTT connection instructions to MQTT source page

integrations/sources/mqtt.mdx

@@ -21,6 +21,26 @@
 
 For example, we create a topic named `iot_data` with the data from various IoT devices at a given timestamp, including temperature, humidity readings, and a status field indicating whether the device is in a normal or abnormal state. For more information to learn about MQTT and get started with it, refer to the [MQTT guide](https://mqtt.org/getting-started/).
 
+<Note>
+**Connecting to RabbitMQ with MQTT**
+
+To connect RisingWave to a RabbitMQ instance using the MQTT protocol, you need to enable and configure RabbitMQ's MQTT plugin on the broker side:
+
+1. Enable the MQTT plugin:
+   ```bash
+   rabbitmq-plugins enable rabbitmq_mqtt
+   ```
+
+2. Set the MQTT v5 feature flag:
+   ```bash
+   rabbitmqctl enable_feature_flag mqtt_v5
+   ```
+
+3. Once configured, you can connect to RabbitMQ using the MQTT connector as described below.
+
+For more details on RabbitMQ's MQTT support, refer to the [RabbitMQ MQTT documentation](https://www.rabbitmq.com/docs/mqtt).
+</Note>
+
 ## Ingest data into RisingWave
 
 When creating a source, we have the option to either persist the data in RisingWave using `CREATE TABLE` or use `CREATE SOURCE` while specifying the connection settings and data format.
@@ -60,10 +80,10 @@
 | Field              | Notes                                                                                                                                                                                                                                                 |
 | :----------------- | :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | url                | **Required**. The URL of the broker to connect to, e.g., tcp://localhost. Must be prefixed with `tcp://`, `mqtt://`, `ssl://`, or `mqtts://` to denote the protocol. `mqtts://` and `ssl://` use native certificates if no CA is specified.                           |
 | qos                | **Optional**. The quality of service for publishing messages. Defaults to at\_most\_once. Options include `at_most_once`, `at_least_once`, or `exactly_once`.                                                                                              |
 | username           | **Optional**. Username for the MQTT broker.                                                                                                                                                                                                               |
 | password           | **Optional**. Password for the MQTT broker.                                                                                                                                                                                                               |
 | client\_prefix     | **Optional**. Prefix for the MQTT client ID. Defaults to "risingwave".                                                                                                                                                                                    |
 | clean\_start       | **Optional**. Determines if all states from queues are removed when the client disconnects.<ul><li>If true, the broker clears all client states upon disconnect;</li><li>If false, the broker retains the client state and resumes pending operations upon reconnection.</li></ul> |
 | inflight\_messages | **Optional**. Maximum number of inflight messages. Defaults to 100.                                                                                                                                                                                       |
 | max\_packet\_size | **Optional**. The maximum message size for the MQTT client.                                                                                                                                                                                       |