docs.capi: Fix tp_as_async doc
diff --git a/Doc/c-api/typeobj.rst b/Doc/c-api/typeobj.rst
index 37dc635..ed83e82 100644
--- a/Doc/c-api/typeobj.rst
+++ b/Doc/c-api/typeobj.rst
@@ -220,7 +220,7 @@
the subtype's :c:member:`~PyTypeObject.tp_setattr` and :c:member:`~PyTypeObject.tp_setattro` are both *NULL*.
-.. c:member:: void* PyTypeObject.tp_as_async
+.. c:member:: PyAsyncMethods* tp_as_async
Pointer to an additional structure that contains fields relevant only to
objects which implement :term:`awaitable` and :term:`asynchronous iterator`