[docs] [issue26240] Docstring of the subprocess module should be cleaned up

[Tim Mitchell]

Tim Mitchell added the comment:

Am now working from tip of default in mercurial (Python 3.6).

* Removed all changes to subprocess.rst.

subprocess.__doc__
* Trimmed down even further - removed function signatures.
* added note to see Python docs for complete description.

Exception docs
* just list attributes rather than describing them - they are pretty self-explanatory.

Popen.__doc__ 
* Trimmed down to just list arguments with 1 or 2 liner descriptions. 
* Added note to see Python docs for complete description.
* added encoding and errors arguments

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Added file: http://bugs.python.org/file45140/subprocess2.patch

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<http://bugs.python.org/issue26240>
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