[DOC] Tweaks for StringIO#close_write (#150) #522

Job	Run time
ruby-versions / Generate Ruby versions	6s
ubuntu-24.04 2.7	49s
ubuntu-24.04 3.2	21s
ubuntu-24.04 3.0	17s
ubuntu-24.04 3.1	12s
ubuntu-24.04 3.3	15s
ubuntu-22.04 3.0	14s
ubuntu-22.04 3.3	18s
ubuntu-22.04 3.4	18s
ubuntu-22.04 3.1	23s
ubuntu-24.04 3.4	19s
ubuntu-24.04 jruby-head	1m 3s
ubuntu-24.04 debug	23s
ubuntu-22.04 2.7	42s
ubuntu-22.04 3.2	24s
ubuntu-22.04 truffleruby-head	23s
ubuntu-24.04 truffleruby-head	23s
ubuntu-22.04 head	18s
ubuntu-24.04 head	17s
ubuntu-22.04 debug	23s
ubuntu-22.04 jruby-head	1m 5s
	8m 53s

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