[DOC] Tweaks for StringIO#eof? (#160) #546

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-24.04 3.0	22s
ubuntu-24.04 3.1	27s
ubuntu-24.04 3.4	21s
ubuntu-24.04 3.2	30s
ubuntu-24.04 jruby-head	1m 14s
ubuntu-24.04 head	22s
ubuntu-24.04 debug	31s
ubuntu-24.04 2.7	42s
ubuntu-22.04 3.4	27s
ubuntu-22.04 3.1	28s
ubuntu-22.04 3.0	29s
ubuntu-22.04 3.3	30s
ubuntu-22.04 debug	38s
ubuntu-22.04 2.7	42s
ubuntu-24.04 3.3	22s
ubuntu-24.04 truffleruby-head	40s
ubuntu-22.04 head	21s
ubuntu-22.04 3.2	27s
ubuntu-22.04 truffleruby-head	40s
ubuntu-22.04 jruby-head	1m 14s
	11m 31s

Provide feedback