test

Enhancements (mostly documentation) #261

Job	Run time
ruby-versions / Generate Ruby versions	15s
build (3.3 / ubuntu-latest)	26s
build (3.2 / ubuntu-latest)	1m 17s
build (3.4 / ubuntu-latest)	45s
build (jruby / ubuntu-latest)	45s
build (truffleruby-head / ubuntu-latest)	36s
build (head / ubuntu-latest)	57s
	5m 1s

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