RemovedeadlinkinCONTRIBUTING.md

I don't think there was an issue for this, but this is just removing a dead link in CONTRIBUTING.md. The Linting Clippy with your local changes section seems to have been removed without updating the table of contents.

I'm not sure if I should have opened an issue, but it seemed like a trivial fix to me.

该提问来源于开源项目：rust-lang/rust-clippy