docs(CI): Advertise the commit style used

Author: epage

azure-pipelines.yml

@@ -24,7 +24,9 @@ stages:
         git: crate-ci/committed
         target: 'x86_64-unknown-linux-gnu'
         to: $(Build.StagingDirectory)/tools
-    - script: $(Build.StagingDirectory)/tools/committed HEAD~..HEAD^2 --no-merge-commit -vv
+    - script: |
+        echo "This project uses Conventional style, see https://www.conventionalcommits.org"
+        $(Build.StagingDirectory)/tools/committed HEAD~..HEAD^2 --no-merge-commit -vv
       displayName: Committed
     condition: and(succeeded(), eq(variables['Build.Reason'], 'PullRequest'))