Update release note for maintenance release (#11582)

all/src/main/templates/release-notes.html

@@ -59,13 +59,13 @@
 
         <p>
             Vaadin Framework @version@ is a
-<!--            maintenance release that includes a number of bug fixes, as listed in the <a href="#changelog">change log</a> below. -->
-                feature release that includes
+                maintenance release that includes a number of bug fixes, as listed in the <a href="#changelog">change log</a> below. 
+<!--            feature release that includes -->
 <!--            pre-release for evaluating -->
-                a number of new features and bug fixes, as listed in the <a
+<!--            a number of new features and bug fixes, as listed in the <a
                 href="#enhancements">list of enhancements</a> and <a
                 href="#changelog">change log</a> below.
-		The API in this beta version is not considered final and may change based on your feedback.
+		The API in this beta version is not considered final and may change based on your feedback.-->
 	</p>
 
         <!-- ================================================================ -->