Auto merge of #43823 - tchajed:fix-pr-link, r=frewsxcv
Auto merge of #43823 - tchajed:fix-pr-link, r=frewsxcv

Update GitHub pull request documentation link

It looks like the GitHub documentation has been re-organized so that the "fork and pull" model isn't explained alongside the PR process in one convenient link any more.

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