Merge pull request #5459 from kenjis/fix-docs-html_helper.rst

docs: remove out of dated raw html in html_helper.rst

Author: paulbalandan

user_guide_src/source/helpers/html_helper.rst

@@ -8,10 +8,6 @@ HTML.
 .. contents::
     :local:
 
-.. raw:: html
-
-    <div class="custom-index container"></div>
-
 Loading this Helper
 ===================