[docs] [issue19273] Update PCbuild/readme.txt

[Roundup Robot]

Roundup Robot added the comment:

New changeset 212b4b61fa05 by Tim Golden in branch 'default':
Closes issue #19273: clean up the pcbuild readme.txt (Patch by Zachary Ware)
http://hg.python.org/cpython/rev/212b4b61fa05

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nosy: +python-dev

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