gh-144329: Clarify that ._pth files are Windows-only in site module documentation #144335
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Description
This PR fixes the ambiguity in the
sitemodule documentation regarding._pthfiles. As noted in issue gh-144329, the current text does not explicitly state that the underscore-prefixed.pthfiles are a feature exclusive to the Windows embeddable distribution.Changes
.. note::block toDoc/library/site.rstexplaining the Windows-only nature of._pthfiles.finding_modulessection for further technical context on isolated environments.Verification
I have built the documentation locally using
make html(on Windows viamake.bat html) and confirmed the new note renders correctly and the cross-reference link is functional.📚 Documentation preview 📚: https://cpython-previews--144335.org.readthedocs.build/