docs(guide/directive): clarify use of binding to scopes

The use of 'angular' as sample text is confusing to the newbie in that they are forced
to confirm that the text 'angular' is not a keyword or otherwise referring to a system
component. This is changed to a more obvious sample text.

The most common form of `ngBind` is moved to the top of the list.

Closes #4237

docs/content/guide/directive.ngdoc

@@ -27,28 +27,28 @@ attribute only.)
   <!-- directive: my-dir exp -->
 </pre>
 
-Directives can be invoked in many different ways, but are equivalent in the end result as shown in
-the following example.
+The following demonstrates the various ways a Directive (ngBind in this case) can be referenced from within a template.
 
 <doc:example>
   <doc:source >
    <script>
      function Ctrl1($scope) {
-       $scope.name = 'angular';
+       $scope.name = 'Max Karl Ernst Ludwig Planck (April 23, 1858 – October 4, 1947)';
      }
    </script>
    <div ng-controller="Ctrl1">
      Hello <input ng-model='name'> <hr/>
+     &lt;span ng-bind="name"&gt; <span ng-bind="name"></span> <br/>
      &lt;span ng:bind="name"&gt; <span ng:bind="name"></span> <br/>
      &lt;span ng_bind="name"&gt; <span ng_bind="name"></span> <br/>
-     &lt;span ng-bind="name"&gt; <span ng-bind="name"></span> <br/>
      &lt;span data-ng-bind="name"&gt; <span data-ng-bind="name"></span> <br/>
      &lt;span x-ng-bind="name"&gt; <span x-ng-bind="name"></span> <br/>
    </div>
   </doc:source>
   <doc:scenario>
     it('should show off bindings', function() {
-      expect(element('div[ng-controller="Ctrl1"] span[ng-bind]').text()).toBe('angular');
+      expect(element('div[ng-controller="Ctrl1"] span[ng-bind]').text())
+        .toBe('Max Karl Ernst Ludwig Planck (April 23, 1858 – October 4, 1947)');
     });
   </doc:scenario>
 </doc:example>