macos

[DOC] Tweaks for StringIO#pos #610

Job	Run time
ruby-versions / Generate Ruby versions	4s
macos-13 3.0	23s
macos-13 3.2	24s
macos-13 3.1	26s
macos-13 2.7	1m 3s
macos-13 debug	28s
macos-13 3.3	24s
macos-13 jruby-head	1m 6s
macos-13 3.4	40s
macos-13 head	22s
macos-14 2.7	38s
macos-14 3.2	20s
macos-14 3.4	16s
macos-14 jruby-head	45s
macos-14 3.0	19s
macos-14 3.3	14s
macos-14 head	17s
macos-14 debug	20s
macos-14 3.1	15s
	8m 44s

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