macos

[DOC] Tweaks for StringIO.new #491

Job	Run time
ruby-versions / Generate Ruby versions	5s
macos-13 3.0	29s
macos-13 3.3	33s
macos-14 3.3	14s
macos-13 3.4	30s
macos-13 debug	52s
macos-13 head	44s
macos-13 3.2	21s
macos-13 jruby-head	2m 43s
macos-13 3.1	24s
macos-13 2.7	2m 4s
macos-14 debug	25s
macos-14 3.0	13s
macos-14 3.1	17s
macos-14 3.2	19s
macos-14 2.7	32s
macos-14 head	16s
macos-14 jruby-head	35s
macos-14 3.4	19s
	11m 55s

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