Minor reword

Author: javiereguiluz

reference/forms/types/options/help_html.rst.inc

@@ -3,5 +3,6 @@ help_html
 
 **type**: ``bool`` **default**: ``false``
 
-Define if the help content will be escaped when rendered or not. Default is `false`,
-the HTML content is escaped. Set it to true if you want to use HTML help message.
+By default, the contents of the ``help`` option are escaped before rendering
+them in the template. Set this option to ``true`` to not escape them, which is
+useful when the help contains HTML elements.