Unpend rdoc dialog tests #2163

Job	Run time
ruby-versions / Generate Ruby versions	2s
rake test 2.7 (latest reline)	48s
rake test 2.7	54s
rake test 3.0 (latest reline)	39s
rake test 3.0	29s
rake test 3.1 (latest reline)	39s
rake test 3.1	27s
rake test 3.2 (latest reline)	34s
rake test 3.2	37s
rake test head (latest reline)	28s
rake test head	37s
rake test truffleruby-head (latest reline)	5m 29s
rake test truffleruby-head	5m 21s
vterm-yamatanooroti 2.7 (latest reline)	1m 8s
vterm-yamatanooroti 2.7	1m 21s
vterm-yamatanooroti 3.0 (latest reline)	33s
vterm-yamatanooroti 3.0	1m 0s
vterm-yamatanooroti 3.1 (latest reline)	32s
vterm-yamatanooroti 3.1	35s
vterm-yamatanooroti 3.2 (latest reline)	43s
vterm-yamatanooroti 3.2	33s
vterm-yamatanooroti head (latest reline)	29s
vterm-yamatanooroti head	31s
	24m 29s

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