[docs] [issue29956] math.exp documentation is misleading

Serhiy Storchaka added the comment: Proposed patch applies Mark's fix to math.expm1() and cmath.exp(), adds the accuracy note to math.exp(), adds italic to mathematical constants, fixes empty lines. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue29956> _______________________________________