[docs] [issue25874] Add notice that XP is not supported on Python 3.5+

Roundup Robot added the comment: New changeset 5114871a3ac6 by Brett Cannon in branch '3.5': Issue #25874: Clarify platform support in the "Using Python on Windows" doc. https://hg.python.org/cpython/rev/5114871a3ac6 New changeset c6bd004671a7 by Brett Cannon in branch 'default': Merge for issue #25874 https://hg.python.org/cpython/rev/c6bd004671a7 ---------- nosy: +python-dev _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue25874> _______________________________________