test

[DOC] Revise some examples #252

Job	Run time
ruby-versions / Generate Ruby versions	4s
build (2.5 / windows-latest)	1m 51s
build (2.5 / ubuntu-latest)	23s
build (2.6 / macos-latest)	38s
build (2.7 / ubuntu-latest)	27s
build (2.6 / windows-latest)	2m 15s
build (2.7 / macos-latest)	30s
build (2.7 / windows-latest)	1m 34s
build (2.6 / ubuntu-latest)	27s
build (3.1 / windows-latest)	54s
build (3.0 / windows-latest)	1m 8s
build (3.1 / macos-latest)	16s
build (3.0 / macos-latest)	17s
build (3.1 / ubuntu-latest)	9s
build (3.3 / macos-latest)	13s
build (3.3 / windows-latest)	56s
build (3.3 / ubuntu-latest)	16s
build (3.4 / macos-latest)	13s
build (3.0 / ubuntu-latest)	10s
build (3.2 / ubuntu-latest)	19s
build (3.2 / windows-latest)	1m 17s
build (3.2 / macos-latest)	12s
build (3.4 / ubuntu-latest)	22s
build (jruby / ubuntu-latest)	44s
build (truffleruby / ubuntu-latest)	24s
build (3.4 / windows-latest)	1m 3s
build (head / ubuntu-latest)	9s
build (head / macos-latest)	15s
build (mswin / windows-latest)	1m 13s
build (truffleruby-head / ubuntu-latest)	21s
build (jruby-head / ubuntu-latest)	47s
build (truffleruby-head / macos-latest)	30s
build (mingw / windows-latest)	1m 0s
build (truffleruby / macos-latest)	34s
	21m 51s

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