Remove dfn for aria bibref

Author: marcoscaceres

index.html

@@ -74,7 +74,7 @@ <h2 id="rules-wd">
         <dfn data-cite="wai-aria-1.1#implicit_semantics">implicit ARIA semantics</dfn>
         of a given HTML element. The <a>implicit ARIA semantics</a> for
         HTML elements are defined in the
-        <dfn>[[html-aam-1.0|HTML Accessibility API Mappings]]</dfn> specification.
+        [[html-aam-1.0|HTML Accessibility API Mappings]] specification.
       </p>
       <p>
         The constraints defined in this specification are intended to prevent