[DOC] Tweaks for StringIO#each_line #568

Job	Run time
ruby-versions / Generate Ruby versions	5s
ubuntu-24.04 2.7	33s
ubuntu-24.04 3.4	18s
ubuntu-24.04 3.2	18s
ubuntu-22.04 3.1	14s
ubuntu-24.04 truffleruby-head	28s
ubuntu-24.04 head	15s
ubuntu-24.04 3.1	18s
ubuntu-24.04 3.3	20s
ubuntu-22.04 3.0	17s
ubuntu-24.04 debug	22s
ubuntu-22.04 3.2	22s
ubuntu-22.04 2.7	32s
ubuntu-24.04 3.0	19s
ubuntu-22.04 3.3	19s
ubuntu-22.04 debug	20s
ubuntu-22.04 3.4	16s
ubuntu-22.04 jruby-head	1m 10s
ubuntu-22.04 head	20s
ubuntu-24.04 jruby-head	1m 17s
ubuntu-22.04 truffleruby-head	32s
ruby-versions / Generate Ruby versions	5s
ubuntu-24.04 3.1	18s
ubuntu-24.04 debug	22s
ubuntu-24.04 3.0	19s
ubuntu-24.04 head	15s
ubuntu-24.04 jruby-head	1m 17s
ubuntu-24.04 truffleruby-head	28s
ubuntu-24.04 3.4	18s
ubuntu-24.04 3.2	18s
ubuntu-22.04 3.0	17s
ubuntu-24.04 3.3	20s
ubuntu-22.04 3.1	14s
ubuntu-22.04 3.4	16s
ubuntu-22.04 3.2	22s
ubuntu-24.04 2.7	45s
ubuntu-22.04 truffleruby-head	32s
ubuntu-22.04 2.7	46s
ubuntu-22.04 3.3	19s
ubuntu-22.04 debug	20s
ubuntu-22.04 jruby-head	1m 10s
ubuntu-22.04 head	20s
	18m 16s

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