macos

[DOC] Tweaks for StringIO#pos= #611

Job	Run time
ruby-versions / Generate Ruby versions	3s
macos-13 3.0	39s
macos-13 3.2	35s
macos-13 2.7	1m 7s
macos-13 3.4	35s
macos-13 3.1	22s
macos-13 head	31s
macos-13 3.3	30s
macos-13 jruby-head	1m 24s
macos-13 debug	37s
macos-14 3.0	20s
macos-14 3.1	24s
macos-14 3.2	21s
macos-14 2.7	29s
macos-14 3.4	16s
macos-14 3.3	16s
macos-14 head	15s
macos-14 debug	21s
macos-14 jruby-head	47s
	9m 52s

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