Clarify the doc for MaybeUninit::zeroed on incorrect use
Clarify the doc for MaybeUninit::zeroed on incorrect use

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