macos

[DOC] Tweaks for StringIO#closed? #501

Job	Run time
ruby-versions / Generate Ruby versions	4s
macos-13 2.7	1m 42s
macos-13 3.0	22s
macos-13 3.3	21s
macos-13 3.4	23s
macos-13 jruby-head	1m 20s
macos-14 3.0	17s
macos-13 3.2	48s
macos-14 3.1	17s
macos-14 debug	17s
macos-14 2.7	29s
macos-13 debug	30s
macos-14 3.3	12s
macos-13 head	33s
macos-14 jruby-head	34s
macos-14 3.4	14s
macos-14 head	14s
macos-14 3.2	13s
macos-13 3.1	20s
	9m 10s

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