Removed ';' in lambdas (#11628)

* Removed ';' in lambdas

credits to @voltor

* Merge branch 'master' into ZheSun88-patch-1

documentation/advanced/advanced-dragndrop.asciidoc

@@ -51,7 +51,7 @@ The [classname]#DragStartEvent# is fired when the drag has started, and the [cla
 [source, java]
 ----
 dragSource.addDragStartListener(event ->
-    Notification.show("Drag event started");
+    Notification.show("Drag event started")
 );
 dragSource.addDragEndListener(event -> {
     if (event.isCanceled()) {
@@ -69,11 +69,11 @@ It is possible to transfer any Object as server side data to the drop target if
 [source, java]
 ----
 dragSource.addDragStartListener(event ->
-    dragSource.setDragData(myObject);
+    dragSource.setDragData(myObject)
 );
 dragSource.addDragEndListener(event ->
-    dragSource.setDragData(null);
-};
+    dragSource.setDragData(null)
+);
 ----
 
 === CSS Style Rules