[docs] [issue13074] Improve documentation of locale encoding functions

Changes by Ezio Melotti <ezio.melotti@gmail.com>: ---------- nosy: +ezio.melotti stage: -> needs patch versions: -Python 2.6, Python 3.1, Python 3.4 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue13074> _______________________________________