Update Windows doc about building Python
Update Windows doc about building Python

BAZEL_PYTHON was only used for the old MSVC python wrapper script. After we use wrapper-free CROSSTOOL by default, it's not used anymore.
It has nothing to do with building Python rules. The correct way to specify python interpreter is to use --python_path flag.

RELNOTES: None
PiperOrigin-RevId: 168655953

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