[docs] [issue18572] Remove redundant note about surrogates in string escape doc

Berker Peksag added the comment: I removed the sentence in 3.5 and default branches. ---------- nosy: +berker.peksag resolution: -> fixed stage: needs patch -> resolved status: open -> closed versions: +Python 3.5, Python 3.6 -Python 3.3, Python 3.4 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue18572> _______________________________________