Document the correct default value #261

Job	Run time
Check Style	4s
features	45s
Test with Miri	42s
Check MSRV (1.63)	1m 21s
Test stable on ubuntu-latest	29s
Test stable on windows-latest	2m 7s
Test stable on macOS-latest	1m 9s
Test beta on ubuntu-latest	28s
Test beta on windows-latest	1m 9s
Test beta on macOS-latest	1m 1s
Test nightly on ubuntu-latest	30s
Test nightly on windows-latest	1m 0s
Test nightly on macOS-latest	50s
Build docs	18s
CI is green	1s
	11m 54s

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