macos

[DOC] Doc for StringIO.getc #550

Job	Run time
ruby-versions / Generate Ruby versions	4s
macos-13 3.1	19s
macos-13 2.7	1m 8s
macos-13 3.2	21s
macos-13 3.0	26s
macos-14 3.0	22s
macos-14 2.7	31s
macos-13 jruby-head	1m 47s
macos-13 3.4	38s
macos-13 head	25s
macos-14 3.4	14s
macos-13 3.3	25s
macos-13 debug	51s
macos-14 3.2	25s
macos-14 3.1	15s
macos-14 head	50s
macos-14 jruby-head	39s
macos-14 3.3	54s
macos-14 debug	18s
	10m 52s

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