Update menu name after code review

docs/_includes/themes/zeppelin/_navigation.html

@@ -72,8 +72,8 @@
                 <li><a href="{{BASE_PATH}}/displaysystem/display.html">Text</a></li>
                 <li><a href="{{BASE_PATH}}/displaysystem/display.html#html">Html</a></li>
                 <li><a href="{{BASE_PATH}}/displaysystem/table.html">Table</a></li>
-                <li><a href="{{BASE_PATH}}/displaysystem/back-end-angular.html">Back-End Angular Interactions</a></li>
-                <li><a href="{{BASE_PATH}}/displaysystem/front-end-angular.html">Front-End Angular Interactions</a></li>
+                <li><a href="{{BASE_PATH}}/displaysystem/back-end-angular.html">Angular (backend API)</a></li>
+                <li><a href="{{BASE_PATH}}/displaysystem/front-end-angular.html">Angular (frontend API)</a></li>
               </ul>
             </li>
             <li>

docs/displaysystem/back-end-angular.md

@@ -1,7 +1,7 @@
 ---
 layout: page
-title: "Back-end Angular Interactions"
-description: ""
+title: "Angular (backend API)"
+description: "Angular (backend API)"
 group: display
 ---
 <!--
@@ -20,7 +20,7 @@ limitations under the License.
 {% include JB/setup %}
 
 
-## Back-end Angular Interactions in Zeppelin
+## Back-end Angular API in Zeppelin
 
 Angular display system treats output as a view template for [AngularJS](https://angularjs.org/).
 It compiles templates and displays them inside of Zeppelin.

docs/displaysystem/front-end-angular.md

@@ -1,7 +1,7 @@
 ---
 layout: page
-title: "Front-end Angular Interactions"
-description: ""
+title: "Angular (frontend API)"
+description: "Angular (frontend API)"
 group: display
 ---
 <!--
@@ -20,7 +20,7 @@ limitations under the License.
 {% include JB/setup %}
 
 
-## Front-end Angular Interactions in Zeppelin
+## Front-end Angular API in Zeppelin
 
 In addition to the back-end API to handle Angular objects binding, Zeppelin also exposes a simple AngularJS **`z`** object on the front-end side to expose the same capabilities.