N&N for Theme Improvements

Refers to eclipse-platform/eclipse.platform.ui#2114

news/4.33/platform.html

@@ -153,8 +153,7 @@ <h2>Themes and Styling </h2>
           <li>Views use a darker background color.</li>
         </ol>
         <p>
-        We have been working hard on an improved version of the light theme that follows these 
-        design decisions. These improvement are not yet completed but are available as a preview. 
+        These improvement are not yet completed but are available as a preview. 
         </p>
         <p><img style="max-width: 600px;" src="images/preview-theme.png" alt="Preview Theme"/></p>
         <p>