[docs] Fix more typos in .py files (issue 18803)

[ezio.melotti at gmail.com]

http://bugs.python.org/review/18803/diff/9027/Lib/inspect.py
File Lib/inspect.py (right):

http://bugs.python.org/review/18803/diff/9027/Lib/inspect.py#newcode50
Lib/inspect.py:50: # back to hard-coding so the dependency is optional
Apparently the "hardcoding" spelling is accepted too (and I prefer it).

http://bugs.python.org/review/18803/