docs: Additional guide updates #588

Job	Run time
tests (ubuntu-latest, 2.4, test)	2m 36s
tests (ubuntu-latest, 2.5, test)	2m 40s
tests (ubuntu-latest, 2.6, test)	2m 44s
tests (ubuntu-latest, 2.7, test)	2m 22s
tests (ubuntu-latest, 3.0, test)	2m 17s
tests (ubuntu-latest, 3.1, test)	1m 59s
tests (ubuntu-latest, 3.2, test)	1m 50s
tests (ubuntu-latest, jruby, test)	10m 33s
tests (ubuntu-latest, truffleruby, test)	8m 14s
tests (macos-latest, 2.4, test)	3m 33s
tests (macos-latest, 3.2, test)	3m 25s
tests (windows-latest, 2.4, test)	7m 15s
tests (windows-latest, 3.2, test)	7m 6s
tests (ubuntu-latest, 3.2, rubocop , yardoc , build)	35s
	57m 9s

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