Update release note for framework 8.6.0.beta1 (#11205)

* Update release note for framework 8.6.0.beta1

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

@@ -65,7 +65,7 @@
                 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 alpha 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>
 
         <!-- ================================================================ -->
@@ -83,8 +83,10 @@
             enhancements. Below is a list of the most notable changes:</p>
 
         <ul>
-            <li>Improvements in <tt>MenuBar</tt> client-side customization.</tt>
-            <li>Support for improved version of <tt>ContextMenu</tt> add-on.</li>
+            <li>Improvements in <tt>MenuBar</tt> client-side customization.</tt></li>
+            <li>Support for improved version of <tt>ContextMenu</tt> add-on (version 3.0.0.beta1).</li>
+            <li>Rewrite <tt>OSGi</tt> bundles activation mechanism to follow <tt>OSGi</tt> best practices</li>
+            <li>Change the return type of <tt>Grid.asMultiSelect</tt> and <tt>Grid.asSingleSelect</tt> that has API to access the features of corresponding selection model</li>
         </ul>
 
         </p>
@@ -100,7 +102,7 @@
         <h2 id="incompatible">Incompatible or Behavior-altering Changes in @version-minor@</h2>
 
         <ul>
-            <li><tt>VOverlay</tt> workaround with <tt>static</tt> reference to current overlay has been removed</tt>
+            <li><tt>VOverlay</tt> workaround with <tt>static</tt> reference to current overlay has been removed</tt></li>
         </ul>
 
         <h2>For incompatible or behavior-altering changes in 8.5, please see <a href="https://vaadin.com/download/release/8.5/8.5.0/release-notes.html#incompatible">8.5 release notes</a></h2>