gh-125436: Doc: Add missing `allow_unnamed_section` parameter to ``… #10483

Job	Run time
Run mypy on Lib/_pyrepl	24s
Run mypy on Lib/test/libregrtest	24s
Run mypy on Tools/build	24s
Run mypy on Tools/cases_generator	23s
Run mypy on Tools/clinic	24s
Run mypy on Tools/jit	23s
Run mypy on Tools/peg_generator	27s
Run mypy on Tools/wasm	24s
	3m 13s

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