[docs] SemLock acquire() keyword arg 'blocking' is invalid (issue 23484)

[berker.peksag at gmail.com]

http://bugs.python.org/review/23484/diff/14347/Doc/library/multiprocessing.rst
File Doc/library/multiprocessing.rst (right):

http://bugs.python.org/review/23484/diff/14347/Doc/library/multiprocessing.rst#newcode1199
Doc/library/multiprocessing.rst:1199: .. versionchanged:: 2.7
If the timeout parameter was added in 2.7 and 3.0, we can remove this
directive on 3.4 and default branches since it's there for the beginning
of Python 3.

On the other hand, for example, if it was added in 2.7 and 3.2, we
should change it to .. versionchanged:: 3.2 in Python 3 documentation.

http://bugs.python.org/review/23484/