Fix bad language in release notes

Change-Id: I9a348ebd6ae41a1a7d03ae9a00bcc5935a4bc4e1

WebContent/release-notes.html

@@ -89,7 +89,7 @@
 
         <h2 id="enhancements">Enhancements in Vaadin @version-minor@</h2>
 
-        <p>The @version-minor@ includes many major and minor
+        <p>Vaadin @version-minor@ includes many major and minor
             enhancements. Below is a list of the most notable changes:</p>
 
         <ul>