message: Fix typo in mirrored_run.py.
diff: @@ -364,7 +364,7 @@ class _MirroredReplicaContext(distribute_lib.ReplicaContext):
  This pauses the current replica thread and passes `fn` and its arguments to
  the main thread. The main thread will wait until all replicas pause, then
  - invoke `fn` with grouped arugments. The current replica thread will continue
  + invoke `fn` with grouped arguments. The current replica thread will continue
  after `fn` completes.
  See `_call_for_each_replica` for the logic in the main thread.
  