Add MaybeUninit::read_uninitialized
Add MaybeUninit::read_uninitialized

Also remove a no-longer accurate comments

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