Rollup merge of #65478 - RalfJung:write, r=jonas-schievink
Rollup merge of #65478 - RalfJung:write, r=jonas-schievink

fmt::Write is about string slices, not byte slices

No idea why the docs talk about bytes, maybe a copy-paste error?

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