[docs] [issue26768] Fix instructions at WindowsCompilers for MSVC/SDKs

[Ivan Pozdeev]

Ivan Pozdeev added the comment:

I preferred DISTUTILS_USE_SDK to MSSDK because the latter is a hack intended for private, advanced use rather than as the standard way: it makes distutils stop guessing and rely on the user to set the environment correctly.

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<http://bugs.python.org/issue26768>
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