Add missing documents (#277) #353

Job	Run time
ruby-versions / Generate Ruby versions	3s
ubuntu-latest 2.7	55s
ubuntu-latest 3.0	25s
ubuntu-latest 3.1	28s
ubuntu-latest 3.2	32s
ubuntu-latest 3.3	34s
ubuntu-latest debug	42s
ubuntu-latest head	23s
macos-latest 2.7	1m 5s
macos-latest 3.0	31s
macos-latest 3.1	31s
macos-latest 3.2	29s
macos-latest 3.3	26s
macos-latest debug	29s
macos-latest head	24s
macos-arm-oss 2.7	54s
macos-arm-oss 3.0	24s
macos-arm-oss 3.1	29s
macos-arm-oss 3.2	24s
macos-arm-oss 3.3	24s
macos-arm-oss debug	28s
macos-arm-oss head	21s
windows-latest 2.7	5m 2s
windows-latest 3.0	3m 43s
windows-latest 3.1	2m 49s
windows-latest 3.2	3m 17s
windows-latest 3.3	3m 27s
windows-latest head	2m 9s
windows-latest mingw	2m 29s
windows-latest mswin	2m 16s
	36m 33s

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