[docs] [issue16813] use paths relative to CPython root in documentation building instructions

Chris Jerdonek added the comment: Thanks. Btw, it works for me on Mac OS X I believe out of the box: Help: Open opens files from a shell. By default, opens each file using the default application for that file. If the file is in the form of a URL, the file will be opened as a URL. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue16813> _______________________________________