[DOC] Tweaks for StringIO#fsync (#173) #584

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-24.04 3.0	11s
ubuntu-24.04 3.1	14s
ubuntu-24.04 3.2	20s
ubuntu-24.04 3.3	18s
ubuntu-24.04 truffleruby-head	23s
ubuntu-24.04 head	16s
ubuntu-24.04 3.4	21s
ubuntu-24.04 jruby-head	1m 2s
ubuntu-24.04 2.7	41s
ubuntu-24.04 debug	24s
ubuntu-22.04 3.1	15s
ubuntu-22.04 3.0	15s
ubuntu-22.04 2.7	46s
ubuntu-22.04 head	13s
ubuntu-22.04 truffleruby-head	23s
ubuntu-22.04 3.2	18s
ubuntu-22.04 jruby-head	1m 3s
ubuntu-22.04 3.4	20s
ubuntu-22.04 debug	23s
ubuntu-22.04 3.3	16s
	8m 26s

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