[DOC] Tweaks for StringIO#gets (#190) #613

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-24.04 2.7	44s
ubuntu-24.04 3.3	20s
ubuntu-24.04 3.0	13s
ubuntu-24.04 3.2	17s
ubuntu-24.04 3.1	18s
ubuntu-24.04 3.4	16s
ubuntu-24.04 debug	21s
ubuntu-22.04 2.7	44s
ubuntu-24.04 truffleruby-head	25s
ubuntu-24.04 jruby-head	1m 1s
ubuntu-22.04 3.1	14s
ubuntu-22.04 3.0	18s
ubuntu-22.04 3.3	16s
ubuntu-22.04 3.2	19s
ubuntu-22.04 3.4	20s
ubuntu-22.04 debug	23s
ubuntu-24.04 head	14s
ubuntu-22.04 truffleruby-head	26s
ubuntu-22.04 jruby-head	1m 6s
ubuntu-22.04 head	12s
	8m 31s

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