Tests

gh-132467: Add test case to check whether GenericAlias instance is not class, update docstring of `typing._GenericAlias` #195029

Job	Run time
Change detection / Create context from changed files	18s
Docs	0s
Ubuntu ${{ ((fromJSON(matrix.free-threading) && '(free-threading)') \|\| '') }} ${{ ((fromJSON(matrix.bolt) && '(bolt)') \|\| '') }}	0s
C API Docs	0s
Check if generated files are up to date	0s
Emscripten	0s
iOS	0s
CIFuzz${{ '' }}	0s
Check if Autoconf files are up to date	0s
Cross build Linux	0s
macOS ${{ ((fromJSON(matrix.free-threading) && '(free-threading)') \|\| '') }}	0s
WASI	0s
All required checks pass	3s
Android (${{ matrix.arch }})	0s
Address sanitizer	0s
Hypothesis tests on Ubuntu	0s
Windows ${{ ((fromJSON(matrix.free-threading) && '(free-threading)') \|\| '') }}	0s
Sanitizers${{ '' }}	0s
Windows MSI${{ '' }}	0s
Ubuntu SSL tests	0s
	21s

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