Rollup merge of #74568 - aticu:master, r=Mark-Simulacrum
Rollup merge of #74568 - aticu:master, r=Mark-Simulacrum

Apply #66379 to `*mut T` `as_ref`

#66379 changed the documentation of `as_ref` on the type `*const T` and `as_mut` on the type `*mut T`, but it missed making that same change for `as_ref` on the type `*mut T`.

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