Clarify python_version parser behavior#21498
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Refs #19729.
This documents the current
python_version/--python-versionbehavior more precisely: the option changes type-checking assumptions, including version checks, but mypy still parses source using the Python interpreter that is running mypy.The note avoids adding a validation restriction because newer target versions can still be useful for version-guarded code, while clarifying that newer syntax requires running mypy on an interpreter that can parse it.
Disclosure: prepared with Codex assistance.
Test plan:
git diff --checkuv run --isolated --with-requirements docs/requirements-docs.txt sphinx-build -W --keep-going -b html docs/source /tmp/mypy-docs-html