Update document for `ResetSynchronizer` #3737

Job	Run time
smoke (amaranth-lang/amaranth-soc)	57s
document	54s
smoke (amaranth-lang/amaranth-stdio)	52s
smoke (amaranth-lang/amaranth-boards)	40s
check-links	1m 2s
test (pypy-3.9)	5m 47s
test (3.10)	3m 11s
test (3.11)	2m 42s
test (pypy-3.11)	4m 11s
test (3.13)	3m 0s
test (3.12)	4m 46s
test (3.14-dev)	2m 49s
test (pypy-3.10)	4m 47s
test (3.9)	2m 36s
publish-docs	5s
publish-docs-dev	0s
required	2s
publish-schemas	5s
publish-package	12s
publish-release	-1s
	38m 37s

Provide feedback