Linkify <view-transition-type> (#14114)

Author: vmpstr

css-view-transitions-2/Overview.bs

@@ -2041,7 +2041,7 @@ The [=@view-transition/types=] descriptor
 		:: Sets the [=ViewTransition/active types=] for the transition to the specified custom identifiers.
 	</dl>
 
-	where <<view-transition-type>> is any <<custom-ident>> other than `none`, and not starting with the string "-ua-".
+	where <dfn>&lt;view-transition-type></dfn> is any <<custom-ident>> other than `none`, and not starting with the string "-ua-".
 
 	Note: the [=@view-transition/types=] descriptor only applies to the {{Document}} in which it is defined.
 	The author is responsible for using their chosen set of types in both documents.