[DOC] Doc for StringIO#getbyte (#162) #548

Job	Run time
ruby-versions / Generate Ruby versions	5s
ubuntu-24.04 3.3	16s
ubuntu-24.04 3.0	18s
ubuntu-24.04 2.7	29s
ubuntu-24.04 3.1	19s
ubuntu-24.04 3.4	21s
ubuntu-24.04 head	18s
ubuntu-22.04 3.0	18s
ubuntu-24.04 3.2	17s
ubuntu-24.04 jruby-head	1m 4s
ubuntu-22.04 2.7	25s
ubuntu-22.04 debug	27s
ubuntu-22.04 3.1	14s
ubuntu-24.04 debug	24s
ubuntu-24.04 truffleruby-head	25s
ubuntu-22.04 head	14s
ubuntu-22.04 3.4	23s
ubuntu-22.04 3.2	24s
ubuntu-22.04 truffleruby-head	27s
ubuntu-22.04 3.3	20s
ubuntu-22.04 jruby-head	59s
	8m 27s

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