[DOC] Tweaks for StringIO#close_read (#149) #514

Job	Run time
ruby-versions / Generate Ruby versions	3s
ubuntu-24.04 3.0	13s
ubuntu-24.04 head	16s
ubuntu-24.04 2.7	42s
ubuntu-22.04 3.0	17s
ubuntu-24.04 truffleruby-head	28s
ubuntu-24.04 debug	22s
ubuntu-24.04 jruby-head	1m 8s
ubuntu-22.04 3.1	22s
ubuntu-22.04 3.3	13s
ubuntu-22.04 3.2	18s
ubuntu-24.04 3.1	14s
ubuntu-24.04 3.4	13s
ubuntu-22.04 debug	25s
ubuntu-24.04 3.3	17s
ubuntu-22.04 2.7	44s
ubuntu-22.04 head	17s
ubuntu-22.04 jruby-head	1m 7s
ubuntu-24.04 3.2	32s
ubuntu-22.04 truffleruby-head	29s
ubuntu-22.04 3.4	20s
	9m 0s

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