Added N&N for Compare Editor

news/4.31/platform.html

@@ -96,6 +96,25 @@ <h2>Views, Dialogs and Toolbar </h2>
     <h2>Text Editors </h2>
     </td>
   </tr>
+
+  <tr id="Number_of_differences_shown"> <!-- https://github.com/eclipse-platform/eclipse.platform/issues/504 -->
+      <td class="title">Compare Editor</td>
+      <td class="content">
+        <p>
+        The number of differences between two files are shown on the toolbar of compare editor 
+        which matches the change markers shown next to the scroll bar in compare editor. 
+        This feature is helpful when the files compared are large and have many differences that cannot be counted manually.
+
+        </p>
+        <p><img src="images/compare_editor_differences.png" alt="Compare Editor"/></p>
+        <p>
+
+        The number of differences change based on the selection in the compilation unit of Java Structure Compare.
+
+        </p>
+        <p><img src="images/java_structure_compare_selection_differences.png" alt="Compare Editor"/></p>
+      </td>
+  </tr>
   <!-- ******************* End of Text Editors ************************************* -->
 
   <!-- ****************** Preferences ************************************* -->