docs($anchorScrollProvider): document disableAutoScrolling method

Author: samuel durand

src/ng/anchorScroll.js

@@ -53,6 +53,19 @@ function $AnchorScrollProvider() {
 
   var autoScrollingEnabled = true;
 
+  /**
+   * @ngdoc method
+   * @name $anchorScrollProvider#disableAutoScrolling
+   *
+   * @description
+   * By default, {@link ng.$anchorScroll $anchorScroll()} will automatically detect changes to
+   * {@link ng.$location#hash $location.hash()} and scroll to the element matching the new hash.<br />
+   * Use this method to disable automatic scrolling.
+   *
+   * If automatic scrolling is disabled, one must explicitly call
+   * {@link ng.$anchorScroll $anchorScroll()} in order to scroll to the element related to the
+   * current hash.
+   */
   this.disableAutoScrolling = function() {
     autoScrollingEnabled = false;
   };