macos

[DOC] Tweaks for StringIO#getc #606

Job	Run time
ruby-versions / Generate Ruby versions	3s
macos-13 2.7	1m 18s
macos-13 3.2	27s
macos-13 3.3	23s
macos-13 head	36s
macos-13 3.4	26s
macos-13 jruby-head	2m 1s
macos-13 debug	33s
macos-14 2.7	38s
macos-13 3.1	31s
macos-13 3.0	32s
macos-14 3.2	21s
macos-14 3.1	21s
macos-14 3.0	16s
macos-14 3.3	13s
macos-14 debug	27s
macos-14 3.4	16s
macos-14 jruby-head	59s
macos-14 head	18s
	10m 39s

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