chore(tidy.yml): improve commit message

Author: marcoscaceres

.github/workflows/tidy.yml

@@ -16,5 +16,5 @@ jobs:
       - uses: peter-evans/create-pull-request@v3
         with:
           title: "Tidied up document using tidy-html5"
-          commit-message: "chore(tidy): tidy up document"
+          commit-message: "chore: tidy up index.html"
           branch: html-tidy