[DOC] Tweaks for StringIO#internal_encoding (#166) #561

Job	Run time
ruby-versions / Generate Ruby versions	6s
ubuntu-24.04 3.0	12s
ubuntu-24.04 debug	20s
ubuntu-24.04 head	13s
ubuntu-24.04 3.1	14s
ubuntu-24.04 2.7	33s
ubuntu-24.04 truffleruby-head	29s
ubuntu-24.04 3.3	21s
ubuntu-22.04 3.1	19s
ubuntu-22.04 3.2	17s
ubuntu-22.04 2.7	32s
ubuntu-22.04 3.0	16s
ubuntu-24.04 3.2	16s
ubuntu-22.04 3.4	17s
ubuntu-24.04 3.4	17s
ubuntu-24.04 jruby-head	1m 9s
ubuntu-22.04 3.3	17s
ubuntu-22.04 head	20s
ubuntu-22.04 debug	23s
ubuntu-22.04 jruby-head	1m 4s
ubuntu-22.04 truffleruby-head	27s
	8m 22s

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