docs: move drain_video_frames docstring to ConnectionManager

SubscriberPeerConnection is internal; ConnectionManager is the public
entry point users actually interact with.

Author: aliev

getstream/video/rtc/connection_manager.py

@@ -61,6 +61,15 @@ def __init__(
         drain_video_frames: bool = True,
         **kwargs: Any,
     ):
+        """
+        Args:
+            drain_video_frames: When True, attaches a MediaBlackhole to each
+                incoming video track so unconsumed frames are drained
+                automatically. This prevents unbounded queue growth in
+                RTCRtpReceiver when no subscriber is consuming the track.
+                The drain is stopped once a real subscriber is added via
+                add_track_subscriber.
+        """
         super().__init__()
 
         # Public attributes

getstream/video/rtc/pc.py

@@ -133,15 +133,6 @@ def __init__(
         configuration: aiortc.RTCConfiguration,
         drain_video_frames: bool = True,
     ) -> None:
-        """
-        Args:
-            drain_video_frames: When True, attaches a MediaBlackhole to each
-                incoming video track so unconsumed frames are drained
-                automatically. This prevents unbounded queue growth in
-                RTCRtpReceiver when no subscriber is consuming the track.
-                The drain is stopped once a real subscriber is added via
-                add_track_subscriber.
-        """
         logger.info(
             f"creating subscriber peer connection with configuration: {configuration}"
         )