Auto merge of #28368 - lfairy:write-impl, r=alexcrichton
Auto merge of #28368 - lfairy:write-impl, r=alexcrichton

There is already a corresponding impl for `std::io::Write`. This change
will make the two traits more consistent.

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