sleep: document
sleep: document

dreamsxin/seastar,dreamsxin/seastar,kjniemi/seastar,syuu1228/seastar,cloudius-systems/seastar,cloudius-systems/seastar,kjniemi/seastar,avikivity/seastar,dreamsxin/seastar,cloudius-systems/seastar,avikivity/seastar,avikivity/seastar,scylladb/seastar,scylladb/seastar,syuu1228/seastar,scylladb/seastar,kjniemi/seastar,syuu1228/seastar