gh-151950: Document `asyncio.BaseEventLoop` and fix `asyncio-extending.rst`#197531

Job	Run time
Change detection / Create context from changed files	12s
C API Docs / Check if all C APIs are documented	10s
Windows ${{ ((fromJSON(matrix.free-threading) && '(free-threading)') \|\| '') }}	0s
Docs / Check EPUB	2m 3s
Docs / Doctest	7m 31s
Docs / Docs	2m 12s
Sanitizers${{ '' }}	0s
Cross build Linux	0s
Android (${{ matrix.arch }})	0s
Hypothesis tests on Ubuntu	0s
CIFuzz${{ '' }}	0s
Emscripten	0s
Windows MSI${{ '' }}	0s
Check if generated files are up to date	0s
iOS	0s
macOS ${{ ((fromJSON(matrix.free-threading) && '(free-threading)') \|\| '') }}	0s
Check if Autoconf files are up to date	0s
Ubuntu ${{ ((fromJSON(matrix.free-threading) && '(free-threading)') \|\| '') }} ${{ ((fromJSON(matrix.bolt) && '(bolt)') \|\| '') }}	0s
WASI	0s
Ubuntu SSL tests	0s
Address sanitizer	-1s
Docs / Check for removed HTML IDs / Check for removed HTML IDs	2m 8s
All required checks pass	2s
	14m 17s

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