docs(a): remove outdated practice

Using a tags as buttons is bad for accessibility and usability

src/ng/directive/a.js

@@ -6,12 +6,10 @@
  * @restrict E
  *
  * @description
- * Modifies the default behavior of the html A tag so that the default action is prevented when
+ * Modifies the default behavior of the html a tag so that the default action is prevented when
  * the href attribute is empty.
  *
- * This change permits the easy creation of action links with the `ngClick` directive
- * without changing the location or causing page reloads, e.g.:
- * `<a href="" ng-click="list.addItem()">Add Item</a>`
+ * For dynamically creating `href` attributes for a tags, see the {@link ng.ngHref `ngHref`} directive.
  */
 var htmlAnchorDirective = valueFn({
   restrict: 'E',