docs/CONTRIBUTING.md: Update instructions for updating LK submodule
@@ -38,6 +38,13 @@ git pull --ff-only origin master
cd ..
```
+And finally regenerate assets:
+```bash
+make update-assets
+```
+
+Commit and submit a PR.
+
## Commit guidelines
The title of the commit message should describe the _what_ about the
