[DOC] Tweaks for StringIO#each_line (#165) #582

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-24.04 2.7	49s
ubuntu-24.04 3.1	14s
ubuntu-24.04 3.0	14s
ubuntu-24.04 3.2	22s
ubuntu-24.04 3.3	19s
ubuntu-24.04 head	24s
ubuntu-24.04 3.4	17s
ubuntu-22.04 2.7	49s
ubuntu-22.04 3.4	23s
ubuntu-22.04 3.1	20s
ubuntu-24.04 debug	30s
ubuntu-22.04 debug	31s
ubuntu-22.04 3.0	19s
ubuntu-22.04 3.2	23s
ubuntu-24.04 jruby-head	1m 9s
ubuntu-22.04 truffleruby-head	20s
ubuntu-22.04 3.3	19s
ubuntu-22.04 jruby-head	1m 20s
ubuntu-22.04 head	21s
ubuntu-24.04 truffleruby-head	22s
	9m 49s

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