[docs] [issue14219] make the Classes tutorial more gentle

Changes by Tshepang Lekhonkhobe <tshepang@gmail.com>: ---------- title: start the Class tutorial in a more gentle manner -> make the Classes tutorial more gentle versions: +Python 3.4 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue14219> _______________________________________