Rollup merge of #61161 - RalfJung:maybe-uninit, r=Centril
Rollup merge of #61161 - RalfJung:maybe-uninit, r=Centril

MaybeUninit doctest: remove unnecessary type ascription

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