Pass symbol to Command.register in doc for consistency #3629

Job	Run time
lint	10s
Debug compatibility test	5m 47s
ruby-versions / Generate Ruby versions	2s
vterm-yamatanooroti 2.7 (latest reline)	1m 5s
rake test 2.7 (latest reline)	1m 22s
vterm-yamatanooroti 2.7	1m 5s
rake test 2.7	1m 22s
vterm-yamatanooroti 3.0 (latest reline)	56s
rake test 3.0 (latest reline)	1m 25s
vterm-yamatanooroti 3.0	57s
rake test 3.0	1m 22s
vterm-yamatanooroti 3.1 (latest reline)	56s
rake test 3.1 (latest reline)	1m 33s
vterm-yamatanooroti 3.1	1m 0s
rake test 3.1	1m 17s
vterm-yamatanooroti 3.2 (latest reline)	54s
rake test 3.2 (latest reline)	1m 16s
vterm-yamatanooroti 3.2	54s
rake test 3.2	1m 17s
vterm-yamatanooroti 3.3 (latest reline)	59s
rake test 3.3 (latest reline)	1m 24s
vterm-yamatanooroti 3.3	1m 2s
rake test 3.3	1m 22s
vterm-yamatanooroti head (latest reline)	58s
rake test head (latest reline)	1m 31s
vterm-yamatanooroti head	59s
rake test head	1m 26s
rake test truffleruby-head (latest reline)	2m 58s
rake test truffleruby-head	2m 58s
	40m 17s

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