Restore heading (#558)

Author: bhardesty

CONTRIBUTING.adoc

@@ -110,6 +110,7 @@ A schema for `quickstart.yml` is provided in `quickstart.schema.json`. To load t
 * Follow link:https://www.jetbrains.com/help/idea/json.html#ws_json_schema_add_custom[this guide for IntelliJ], use `**/quickstart.yml` as the file path pattern
 * Install link:https://marketplace.visualstudio.com/items?itemName=redhat.vscode-yaml[the YAML extension for VS Code], follow the documentation to associate the schema to `**/quickstart.yml`
 
+=== Previewing the quick starts locally
 
 You can preview the quick start catalog and the quick start pages locally. (Note that the preview shows _all_ of the quick starts in the `app-services-guides` repository, not just one quick start.)