Fix typo

Documentation/Report.rst

@@ -2716,7 +2716,8 @@ The *tablesorter* options:
 
   * If there is a public view with the name 'Default' and a user has no choosen a view earlier, that one will be selected.
 
-Customization of tablesorter:
+Customization of tablesorter
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
   * See docs for more options: https://mottie.github.io/tablesorter/docs/index.html
   * Add the desired classes or data attributes to your table html, e.g.: