Rollup merge of #54646 - vn971:fix_std_thread_sleep, r=frewsxcv
Rollup merge of #54646 - vn971:fix_std_thread_sleep, r=frewsxcv

improve documentation on std::thread::sleep

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