📚 Consistent heading levels inside method rdoc #1005

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (3.1 / ubuntu-latest)	47s
build (3.1 / macos-latest)	31s
build (3.1 / windows-latest)	2m 28s
build (3.2 / ubuntu-latest)	46s
build (3.2 / macos-latest)	39s
build (3.2 / windows-latest)	1m 58s
build (3.3 / ubuntu-latest)	34s
build (3.3 / macos-latest)	31s
build (3.3 / windows-latest)	2m 18s
build (head / ubuntu-latest)	45s
build (head / macos-latest)	32s
build (head / windows-latest)	2m 2s
	13m 53s

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