Rollup merge of #35104 - frewsxcv:linked-list-append, r=steveklabnik
Rollup merge of #35104 - frewsxcv:linked-list-append, r=steveklabnik

Rewrite `collections::LinkedList::append` doc example.

None

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