Remove text about callback (removed) in run_on_executor

diff --git a/tornado/concurrent.py b/tornado/concurrent.py
index 3a49940dfab5cb6423741b978b9093f42a2fb547..7638fcfc988b65b287c016a66995ad6bb2b0f9e2 100644 (file)
--- a/tornado/concurrent.py
+++ b/tornado/concurrent.py
@@ -74,8 +74,7 @@ dummy_executor = DummyExecutor()
 def run_on_executor(*args: Any, **kwargs: Any) -> Callable:
     """Decorator to run a synchronous method asynchronously on an executor.
 
-    The decorated method may be called with a ``callback`` keyword
-    argument and returns a future.
+    Returns a future.
 
     The executor to be used is determined by the ``executor``
     attributes of ``self``. To use a different attribute name, pass a