[docs] [issue19391] Fix PCbuild/readme.txt in 2.7 and 3.3

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7b6ac858bb17 by Zachary Ware in branch '2.7':
Issue #19391: Clean up PCbuild/readme.txt
http://hg.python.org/cpython/rev/7b6ac858bb17

New changeset f28a2d072767 by Zachary Ware in branch '3.3':
Issue #19391: Clean up PCbuild/readme.txt
http://hg.python.org/cpython/rev/f28a2d072767

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<http://bugs.python.org/issue19391>
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