[3.10] bpo-45568: Actually use @asynccontextmanager in usage example (GH-29151) (GH-29779)

asvetlov · zsiciarz · web-flow · commit 52d10f6485a1 · 2021-11-25T19:20:17.000+02:00
Automerge-Triggered-By: GH:asvetlov (cherry picked from commit 4dd8219) Co-authored-by: Zbigniew Siciarz <zbigniew@siciarz.net> Co-authored-by: Zbigniew Siciarz <zbigniew@siciarz.net>
diff --git a/Doc/library/contextlib.rst b/Doc/library/contextlib.rst
@@ -130,7 +130,9 @@ Functions and classes provided:
    either as decorators or with :keyword:`async with` statements::
 
      import time
+     from contextlib import asynccontextmanager
 
+     @asynccontextmanager
      async def timeit():
          now = time.monotonic()
          try:
