Rollup merge of #79849 - Digital-Chaos:sleep-zero, r=m-ou-se
Rollup merge of #79849 - Digital-Chaos:sleep-zero, r=m-ou-se

Clarify docs regarding sleep of zero duration

Clarify that the behaviour of sleep() when given a duration of zero is actually platform specific.

aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust