fix doc lint

Author: belm0

Doc/library/asyncio-task.rst

@@ -395,7 +395,7 @@ The ``async with`` statement will wait for all tasks in the group to finish.
 While waiting, new tasks may still be added to the group
 (for example, by passing ``tg`` into one of the coroutines
 and calling ``tg.create_task()`` in that coroutine).  There is also opportunity
-to short-circuit the entire task group with :meth:`cancel`, based on some condition.
+to short-circuit the entire task group with ``tg.cancel()``, based on some condition.
 Once the last task has finished and the ``async with`` block is exited,
 no new tasks may be added to the group.