test

Fix comments about `State#goto_follows` #586

Job	Run time
check-misc (head)	16s
steep-check (head)	40s
test-memory (head)	38s
test-ruby (head, master)	5m 54s
test-ruby (3.0, master)	6m 1s
test-windows (head)	3m 39s
ruby-versions / Generate Ruby versions	3s
test-cpp (head, g++)	22s
test (2.5)	38s
test-cpp (head, clang++)	22s
test-c (head, cc)	15s
test (2.6)	40s
test-c (head, gcc)	21s
test (2.7)	34s
test-c (head, clang)	23s
test (3.0)	22s
test (3.1)	21s
test (3.2)	24s
test (3.3)	21s
test (3.4)	20s
test (head)	13s
	22m 47s

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