[docs] [issue10224] Build 3.x documentation using python3.x

[Sye van der Veen]

Sye van der Veen <syeberman at gmail.com> added the comment:

When I built the documentation on Win7, it failed with a SyntaxError, and it took some digging to find the reason why.  I was hoping that issuing this warning would save others the trouble.

I agree: on Windows, PYTHON is rarely set.  However, look in make.bat: you'll see that when PYTHON is not already set, it's set to ..\pcbuild\python, which is Python 3.

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