Added queue_qos0_messages documentation for bridging

See https://github.com/eclipse/mosquitto/pull/2500

man/mosquitto.conf.5.xml

@@ -954,7 +954,9 @@ log_timestamp_format %Y-%m-%dT%H:%M:%S
 				<listitem>
 					<para>Set to <replaceable>true</replaceable> to queue
 						messages with QoS 0 when a persistent client is
-						disconnected. These messages are included in the limit
+						disconnected. When bridges topics are configured with QoS level 1 or 2 incoming
+						QoS 0 messages for these topics are also queued.
+						These messages are included in the limit
 						imposed by max_queued_messages.  Defaults to
 						<replaceable>false</replaceable>.</para>
 					<para>Note that the MQTT v3.1.1 spec states that only QoS 1