docs: correct paho v1 deprecation comment in bridge

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

pos_briefing_mqtt.py

@@ -104,8 +104,10 @@ def on_message(client, userdata, msg):
 
 
 def main():
-    # Explicit VERSION1 callbacks (paho 2.x defaults to this but warns); our
-    # on_connect/on_message use the (client, userdata, flags, rc) signature.
+    # paho 2.x requires an explicit CallbackAPIVersion. We use VERSION1 to match
+    # our (client, userdata, flags, rc) callback signatures and the working lgtv
+    # bridge. paho logs a one-time deprecation warning for v1 at startup; it is
+    # harmless and does not affect operation.
     client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION1,
                          client_id="pos-briefing-bridge")
     client.username_pw_set(MQTT_USER, MQTT_PASS)