docs: fix typo. #3769

Job	Run time
smoke (amaranth-lang/amaranth-stdio)	57s
smoke (amaranth-lang/amaranth-boards)	38s
smoke (amaranth-lang/amaranth-soc)	1m 3s
test (3.9)	3m 8s
check-links	51s
test (3.12)	3m 25s
test (pypy-3.9)	5m 36s
test (3.10)	2m 19s
test (pypy-3.11)	4m 36s
test (3.13)	2m 39s
test (pypy-3.10)	5m 38s
document	1m 0s
test (3.11)	2m 24s
test (3.14-dev)	2m 0s
publish-docs	5s
publish-docs-dev	0s
required	4s
publish-schemas	5s
publish-package	16s
publish-release	0s
	36m 44s

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