Fixed on_connect and on_disconnect docstrings

Author: REX2626

src/paho/mqtt/client.py

@@ -2444,7 +2444,7 @@ def on_connect(self) -> CallbackOnConnect | None:
 
                 connect_callback(client, userdata, flags, rc)
 
-            * For MQTT it's v5.0::
+            * For MQTT v5.0 it's::
 
                 connect_callback(client, userdata, flags, reason_code, properties)
 
@@ -2731,7 +2731,7 @@ def on_disconnect(self) -> CallbackOnDisconnect | None:
 
                 disconnect_callback(client, userdata, rc)
 
-            * For MQTT it's v5.0::
+            * For MQTT v5.0 it's::
 
                 disconnect_callback(client, userdata, reason_code, properties)