Issue #3180726 by markdorison, walangitan: Missing punctuation in Olivero's...

Issue #3180726 by markdorison, walangitan: Missing punctuation in Olivero's html.html.twig @file documentation

(cherry picked from commit 3f8220ed)

core/themes/olivero/templates/layout/html.html.twig

@@ -19,7 +19,7 @@
  * - db_offline: A flag indicating if the database is offline.
  * - placeholder_token: The token for generating head, css, js and js-bottom
  *   placeholders.
- * - olivero_path: Returns the path to an Olivero theme
+ * - olivero_path: Returns the path to an Olivero theme.
  *
  * @see template_preprocess_html()
  */