build

Restructure IRB's documentation #4194

Job	Run time
Debug compatibility test	5m 55s
lint	12s
ruby-versions / Generate Ruby versions	2s
vterm-yamatanooroti 2.7 (latest reline)	44s
rake test 2.7 (latest reline)	1m 33s
vterm-yamatanooroti 2.7	52s
rake test 2.7	1m 28s
vterm-yamatanooroti 3.0 (latest reline)	39s
rake test 3.0 (latest reline)	1m 27s
vterm-yamatanooroti 3.0	31s
rake test 3.0	1m 30s
vterm-yamatanooroti 3.1 (latest reline)	38s
rake test 3.1 (latest reline)	1m 26s
vterm-yamatanooroti 3.1	35s
vterm-yamatanooroti 3.2 (latest reline)	32s
rake test 3.1	1m 31s
vterm-yamatanooroti 3.2	35s
rake test 3.2 (latest reline)	1m 26s
vterm-yamatanooroti 3.3 (latest reline)	31s
rake test 3.2	1m 22s
vterm-yamatanooroti 3.3	34s
rake test 3.3 (latest reline)	1m 26s
vterm-yamatanooroti head (latest reline)	37s
rake test 3.3	1m 33s
vterm-yamatanooroti head	39s
rake test head (latest reline)	1m 44s
rake test head	1m 48s
	31m 50s

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