macos

[DOC] Tweaks for StringIO.getbyte #605

Job	Run time
ruby-versions / Generate Ruby versions	4s
macos-13 3.0	19s
macos-13 3.3	21s
macos-13 2.7	1m 11s
macos-13 3.2	29s
macos-13 3.1	44s
macos-13 head	36s
macos-13 3.4	23s
macos-13 jruby-head	1m 27s
macos-14 2.7	33s
macos-14 3.0	19s
macos-14 3.1	23s
macos-13 debug	30s
macos-14 3.2	16s
macos-14 3.4	23s
macos-14 head	24s
macos-14 debug	24s
macos-14 jruby-head	45s
macos-14 3.3	16s
	9m 47s

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