pep-0492: Edits in PEP 3152 section

pep-0492.txt

@@ -731,11 +731,10 @@ Differences from this proposal:
 
 3. To make asyncio work with PEP 3152 it would be required to modify
    ``@asyncio.coroutine`` decorator to wrap all functions in an object
-   with a ``__cocall__`` method.  To call *cofunctions* from existing
-   generator-based coroutines it would be required to use ``costart``
-   built-in.  In this proposal ``@asyncio.coroutine`` simply sets
-   ``CO_COROUTINE`` on the wrapped function's code object and
-   everything works automatically.
+   with a ``__cocall__`` method, or to implement ``__cocall__`` on
+   generators.  To call *cofunctions* from existing generator-based
+   coroutines it would be required to use ``costart(cofunc, *args,
+   **kwargs)`` built-in.
 
 4. Since it is impossible to call a *cofunction* without a ``cocall``
    keyword, it automatically prevents the common mistake of forgetting