Fix minor spelling mistake in 492.

pep-0492.txt

@@ -691,7 +691,7 @@ New Standard Library Functions
   in ``await`` expression.  See `Await Expression`_ for details.
 
 * ``sys.set_coroutine_wrapper(wrapper)`` allows to intercept creation
-  of *coroutine objects*.  ``wraper`` must be a callable that accepts
+  of *coroutine objects*.  ``wrapper`` must be a callable that accepts
   one argument: a *coroutine object* or ``None``.  ``None`` resets the
   wrapper.  If called twice, the new wrapper replaces the previous one.
   The function is thread-specific.  See `Debugging Features`_ for more