docs: update CONTRIBUTING.md

CONTRIBUTING.md

@@ -34,10 +34,10 @@ To setup a local development environment we recommend reading [Building Grafana
 ### Pull requests with new features
 Commits should be as small as possible, while ensuring that each commit is correct independently (i.e., each commit should compile and pass tests).
 
-Make sure to include `closes #<issue>` or `fixes #<issue>` in the pull request description.
+Make sure to include `Closes #<issue number>` or `Fixes #<issue number>` in the pull request description.
 
 ### Pull requests with bug fixes
-Please make all changes in one commit if possible. Include `closes #12345` in bottom of the commit message.
+Please make all changes in one commit if possible. Include `Closes #<issue number>` in bottom of the commit message.
 A commit message for a bug fix should look something like this.
 
 ```
@@ -48,7 +48,7 @@ provsioners each provisioner overwrite each other.
 filling up dashboard_versions quite fast if using
 default settings.
 
-closes #12864
+Closes #12864
 ```
 
-If the pull request needs changes before its merged the new commits should be rebased into one commit before its merged.
\ No newline at end of file
+If the pull request needs changes before its merged the new commits should be rebased into one commit before its merged.