[DOC] Doc for StringIO#pread (#195) #634

Job	Run time
ruby-versions / Generate Ruby versions	4s
ubuntu-24.04 3.3	22s
ubuntu-24.04 3.4	25s
ubuntu-24.04 2.7	48s
ubuntu-24.04 3.1	16s
ubuntu-24.04 3.0	20s
ubuntu-24.04 head	15s
ubuntu-24.04 3.2	16s
ubuntu-24.04 jruby-head	1m 8s
ubuntu-22.04 2.7	43s
ubuntu-24.04 debug	30s
ubuntu-24.04 truffleruby-head	35s
ubuntu-22.04 3.3	18s
ubuntu-22.04 truffleruby-head	43s
ubuntu-22.04 3.4	21s
ubuntu-22.04 3.2	18s
ubuntu-22.04 3.1	20s
ubuntu-22.04 jruby-head	1m 11s
ubuntu-22.04 3.0	19s
ubuntu-22.04 head	22s
ubuntu-22.04 debug	33s
	10m 7s

Provide feedback