[docs] [issue13402] Document absoluteness of sys.executable

Petri Lehtinen <petri@digip.org> added the comment: Attached one more patch. The documentation now also mentions None as a possible value. ---------- Added file: http://bugs.python.org/file24380/issue13402_v3.patch _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue13402> _______________________________________