[DOC] Doc for StringIO#each_byte (#157) #534

Job	Run time
ruby-versions / Generate Ruby versions	5s
ubuntu-24.04 3.1	14s
ubuntu-24.04 3.0	13s
ubuntu-24.04 3.3	13s
ubuntu-24.04 head	14s
ubuntu-24.04 3.2	21s
ubuntu-24.04 debug	27s
ubuntu-22.04 3.2	24s
ubuntu-24.04 2.7	43s
ubuntu-24.04 jruby-head	1m 10s
ubuntu-22.04 3.0	20s
ubuntu-24.04 3.4	12s
ubuntu-24.04 truffleruby-head	31s
ubuntu-22.04 3.4	23s
ubuntu-22.04 truffleruby-head	27s
ubuntu-22.04 3.3	18s
ubuntu-22.04 debug	24s
ubuntu-22.04 2.7	39s
ubuntu-22.04 3.1	21s
ubuntu-22.04 jruby-head	1m 4s
ubuntu-22.04 head	13s
	8m 56s

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