Update release note and Since tag (#11639)

* Update release note for 8.9

* Missing Since

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

@@ -83,7 +83,9 @@
             enhancements. Below is a list of the most notable changes:</p>
 
         <ul>
-            <li></li>
+            <li>Adds css class name to <tt>Grid.Editor</tt> on slected row</li>
+	    <li>Improves error handling on <tt>Upload</tt> handler</li>
+	    <li>Improves support for OSGi</li>
         </ul>
 
         </p>
@@ -96,7 +98,7 @@
             to Vaadin Framework 8</a>.
         </p>
 
-        <h2 id="incompatible">Incompatible or Behavior-altering Changes in @version-minor@</h2>
+        <h2 id="incompatible">No Incompatible or Behavior-altering Changes in @version-minor@</h2>
 
         <ul>
             <li></li>

client/src/main/java/com/vaadin/client/ui/VDateField.java

@@ -299,7 +299,7 @@ public abstract class VDateField<R extends Enum<R>> extends FlowPanel
      * rpc is triggered.
      * </p>
      *
-     * @since
+     * @since 8.9
      */
     public void sendBufferedValuesWithDelay() {
         rpc.updateValueWithDelay(bufferedDateString,

shared/src/main/java/com/vaadin/shared/ui/datefield/AbstractDateFieldServerRpc.java

@@ -47,7 +47,7 @@ public interface AbstractDateFieldServerRpc extends ServerRpc {
      * delayed rpc. The rpc will be sent by triggering another non
      * {@link Delayed} annotated rpc.
      *
-     * @since
+     * @since 8.9
      *
      * @param newDateString
      *            the value of the text field part. It enables analyzing invalid