template: Update how to format source code with ./util/dev

Author: tesuji

.github/PULL_REQUEST_TEMPLATE

@@ -18,7 +18,9 @@ checked during review or continuous integration.
 - [ ] `cargo test` passes locally
 - [ ] Executed `util/dev update_lints`
 - [ ] Added lint documentation
-- [ ] Run `cargo fmt`
+- [ ] Run `./util/dev fmt`
+
+[lint_naming]: https://rust-lang.github.io/rfcs/0344-conventions-galore.html#lints
 
 Note that you can skip the above if you are just opening a WIP PR in
 order to get feedback.

doc/adding_lints.md

@@ -368,6 +368,8 @@ output in the `stdout` part.
 
 Before submitting your PR make sure you followed all of the basic requirements:
 
+<!-- Sync this with `.github/PULL_REQUEST_TEMPLATE` -->
+
 - [ ] Followed [lint naming conventions][lint_naming]
 - [ ] Added passing UI tests (including committed `.stderr` file)
 - [ ] `cargo test` passes locally