add missing child object properties linebreak

Author: mikewuu

src/layouts/partials/api-resource.hbs

@@ -116,6 +116,7 @@ This variant has no additional specific properties.
 {{#if listProperties}}
 <details>
   <summary>Child Object Properties</summary>
+
   {{#each listProperties}}
   {{> property-nested this}}
   {{/each}}