Core: Fix reference to whatwg spec

Ref jquery-validation#1372

Author: jzaefferer

src/core.js

@@ -1125,7 +1125,7 @@ $.extend( $.validator, {
 
 		// http://jqueryvalidation.org/email-method/
 		email: function( value, element ) {
-			// From http://www.whatwg.org/specs/web-apps/current-work/multipage/states-of-the-type-attribute.html#e-mail-state-%28type=email%29
+			// From https://html.spec.whatwg.org/multipage/forms.html#valid-e-mail-address
 			// Retrieved 2014-01-14
 			// If you have a problem with this implementation, report a bug against the above spec
 			// Or use custom methods to implement your own email validation