fix: fix broadcast_pyobj breaking VerlEngine (#5997)

python/sglang/srt/utils.py

@@ -897,7 +897,10 @@ def broadcast_pyobj(
     src: int = 0,
     force_cpu_device: bool = True,
 ):
-    """Broadcast inputs from rank=0 to all other ranks with torch.dist backend."""
+    """Broadcast inputs from src rank to all other ranks with torch.dist backend.
+    The `rank` here refer to the source rank on global process group (regardless
+    of dist_group argument).
+    """
     device = torch.device(
         "cuda" if torch.cuda.is_available() and not force_cpu_device else "cpu"
     )