[docs] [issue35616] Change references to '4.0'.

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> One or two versions after using Py_DEPRECATED for all deprecated functions (but not earlier than EOL of 2.7) we can make them issuing run-time warnings.

Maybe we can experiment adding warnings only in development mode, when python3 -X dev is used?

> I'm working on this.

Thanks :-)

----------

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35616>
_______________________________________