[DOC] Tweaks for StringIO.open (#146) #494

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-24.04 3.1	30s
ubuntu-24.04 2.7	57s
ubuntu-24.04 3.0	29s
ubuntu-24.04 3.4	18s
ubuntu-24.04 3.3	29s
ubuntu-22.04 3.0	25s
ubuntu-24.04 3.2	30s
ubuntu-22.04 3.3	27s
ubuntu-24.04 debug	29s
ubuntu-22.04 3.1	31s
ubuntu-22.04 debug	33s
ubuntu-24.04 head	22s
ubuntu-24.04 jruby-head	1m 35s
ubuntu-22.04 jruby-head	1m 31s
ubuntu-22.04 head	23s
ubuntu-22.04 3.4	28s
ubuntu-24.04 truffleruby-head	43s
ubuntu-22.04 truffleruby-head	39s
ubuntu-22.04 3.2	32s
ubuntu-22.04 2.7	54s
	12m 49s

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