node-gyp documentation is out of sync with upstream

[txk2048]

The part of the Windows Environment documentation referring to supported versions of Python is significantly out of sync with upstream

The mentioned part of the documentation states that Python 2.7 is the only supported version, which is not the case anymore as detailed by upstream. In fact upstream additionally supports any version of Python >= 3.5. Not mention Python 2.7 as EOL as of 2020 and recommending people install end of life software is not a good idea.