Issue #28348: Fix typo in asyncio.Task() documentation

Patch by Mariatta Wijaya.

Doc/library/asyncio-task.rst

@@ -374,7 +374,7 @@ Task
 
    A task is responsible for executing a coroutine object in an event loop.  If
    the wrapped coroutine yields from a future, the task suspends the execution
-   of the wrapped coroutine and waits for the completition of the future. When
+   of the wrapped coroutine and waits for the completion of the future. When
    the future is done, the execution of the wrapped coroutine restarts with the
    result or the exception of the future.