Rollup merge of #37523 - d-unseductable:deref_mut_lifetimes, r=bluss
Rollup merge of #37523 - d-unseductable:deref_mut_lifetimes, r=bluss

Elide lifetimes in DerefMut documentation

 - Elide lifetimes to increase the readability of `DerefMut` examples

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