Change step 6 to say 'see step 4' instead of 'see step 6'

docs/sources/contribution.md

@@ -17,7 +17,7 @@ If you are unfamiliar with forking, branching or working with git/Github, here a
 3. Make your changes on your branch.
 4. Test it out locally by running `rails s` and visiting [http://0.0.0.0:3000](http://0.0.0.0:3000) in your favorite browser.
 5. Run `git fetch upstream` and then `git rebase upstream/master` in your branch.
-6. Test again, see step 6.
+6. Test again, see step 4.
 7. Push your branch to your repo (e.g. `git push origin update-homepage`)
 8. Make a pull request against the main repos master branch!