This changes the main documentation, doc strings, source code comments, and a
couple error messages in the test suite. In some cases the word was removed
or edited some other way to fix the grammar.

Fixed the case of the "Ctrl-" prefixes.

Related Issues:

#issue21528
#issue24453

Patch by Alex Gaynor with some modifications by me.

We changed a few details of the pip integration over the course
of the Python 3.4 beta and release candidate cycle, but I hadn't
updated the What's New entry appropriately.

The Py2/Py3 split on POSIX and the generally challenges of
dealing with parallel installs means we haven't attained
complete consistency across all environments, but hopefully
this updated text is clearer about the end result.

Relevant to issue #20909.

closes #20931

Also move NEWS item to correct position (it was in 3.3).

Also move NEWS item to correct position (it was in 3.3).