Rollup merge of #56162 - adrianheine:patch-1, r=withoutboats
Rollup merge of #56162 - adrianheine:patch-1, r=withoutboats

std::str Adapt documentation to reality

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