[docs] [issue27519] update the references to http://mercurial.selenic.com

Stéphane Wirtel added the comment: because we don't want to change a tool but just an URL. you can create an other issue if you prefer to use TortoiseHg. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue27519> _______________________________________