Rollup merge of #87885 - m-ou-se:edition-guide-links, r=rylev
Rollup merge of #87885 - m-ou-se:edition-guide-links, r=rylev

Link to edition guide instead of issues for 2021 lints.

This changes the 2021 lints to not link to github issues, but to the edition guide instead.

Fixes  #86996

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