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

[R. David Murray]

R. David Murray added the comment:

With the --git option, the rietveld service only tries against the default branch.  Without the --git option, it can figure out the changeset the patch is based against and use that.

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nosy: +r.david.murray

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