Closes #13867: remove untrue comment about PyWeakref_Check().

Author: birkenfeld

Include/weakrefobject.h

@@ -51,9 +51,6 @@ PyAPI_DATA(PyTypeObject) _PyWeakref_CallableProxyType;
         ((Py_TYPE(op) == &_PyWeakref_ProxyType) || \
          (Py_TYPE(op) == &_PyWeakref_CallableProxyType))
 
-/* This macro calls PyWeakref_CheckRef() last since that can involve a
-   function call; this makes it more likely that the function call
-   will be avoided. */
 #define PyWeakref_Check(op) \
         (PyWeakref_CheckRef(op) || PyWeakref_CheckProxy(op))