[DOC] RDoc for additions #179

Job	Run time
ruby-versions / Generate Ruby versions	2s
ubuntu-20.04 2.3	30s
ubuntu-20.04 2.4	29s
ubuntu-20.04 2.5	31s
ubuntu-20.04 2.6	32s
ubuntu-20.04 2.7	29s
ubuntu-20.04 3.0	19s
ubuntu-20.04 3.1	21s
ubuntu-20.04 3.2	25s
ubuntu-20.04 head	53s
ubuntu-20.04 jruby	46s
ubuntu-20.04 jruby-head	43s
ubuntu-20.04 truffleruby	36s
ubuntu-20.04 truffleruby-head	33s
ubuntu-22.04 2.3	34s
ubuntu-22.04 2.4	28s
ubuntu-22.04 2.5	30s
ubuntu-22.04 2.6	30s
ubuntu-22.04 2.7	40s
ubuntu-22.04 3.0	19s
ubuntu-22.04 3.1	1m 42s
ubuntu-22.04 3.2	15s
ubuntu-22.04 head	18s
ubuntu-22.04 jruby	1m 56s
ubuntu-22.04 jruby-head	58s
ubuntu-22.04 truffleruby	28s
ubuntu-22.04 truffleruby-head	37s
macos-11 2.3	1m 8s
macos-11 2.4	1m 7s
macos-11 2.5	59s
macos-11 2.6	1m 0s
macos-11 2.7	1m 0s
macos-11 3.0	27s
macos-11 3.1	29s
macos-11 3.2	34s
macos-11 head	44s
macos-11 jruby	53s
macos-11 jruby-head	1m 2s
macos-11 truffleruby	1m 0s
macos-11 truffleruby-head	1m 0s
macos-12 2.3	1m 14s
macos-12 2.4	56s
macos-12 2.5	1m 11s
macos-12 2.6	1m 4s
macos-12 2.7	1m 35s
macos-12 3.0	26s
macos-12 3.1	26s
macos-12 3.2	25s
macos-12 head	27s
macos-12 jruby	1m 50s
macos-12 jruby-head	1m 49s
macos-12 truffleruby	55s
macos-12 truffleruby-head	1m 32s
windows-latest 2.3	1m 0s
windows-latest 2.4	1m 49s
windows-latest 2.5	2m 34s
windows-latest 2.6	2m 34s
windows-latest 2.7	1m 50s
windows-latest 3.0	50s
windows-latest 3.1	53s
windows-latest 3.2	2m 22s
windows-latest head	1m 0s
windows-latest mswin	53s
ubuntu-latest jruby-9.1	50s
ubuntu-latest jruby-9.2	53s
ubuntu-latest jruby-9.3	1m 45s
	1h 0m 50s

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