Add new and noteworthy entry for new eclipse.appName System Property

Eclipse UI PR: eclipse-platform/eclipse.platform.ui#2631
Root Issue: eclipse-packaging/packages#253

Author: azoitl

news/4.35/platform.html

@@ -72,9 +72,19 @@ <h2>Themes and Styling </h2>
   <!-- ******************* General Updates ************************************* -->
   <tr>
     <td id="GeneralUpdates" class="section" colspan="2">
-    <h2>General Updates </h2>
+    <h2>General Updates </h2>    
     </td>
   </tr>
+  <tr id="sysPropAppName"> <!-- https://github.com/eclipse-platform/eclipse.platform.ui/pull/1902 -->
+      <td class="title">New System Property: appName</td>
+      <td class="content">
+        <p>
+        This new system property allows to set the application name with which Eclipse is registered in the operating system. 
+        This option is helpful to distinguish and group Eclipse instances.
+        </p>
+      </td>
+  </tr>
+
   <!-- ******************* End of General Updates ************************************* -->
   <tr><td colspan="2"/></tr>
 </tbody>