Remove extra empty javadocs before package declaration (#8776)

client/src/main/java/com/vaadin/client/VUIDLBrowser.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.client;
 
 import java.util.Iterator;

client/src/main/java/com/vaadin/client/ValueMap.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.client;
 
 import java.util.HashSet;

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

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.client.ui;
 
 /**

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

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-//
 package com.vaadin.client.ui;
 
 import com.google.gwt.core.client.Scheduler;

client/src/main/java/com/vaadin/client/ui/dd/VAcceptAll.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.client.ui.dd;
 
 import com.vaadin.client.UIDL;

client/src/main/java/com/vaadin/client/ui/dd/VAnd.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.client.ui.dd;
 
 import com.vaadin.client.UIDL;

client/src/main/java/com/vaadin/client/ui/dd/VContainsDataFlavor.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.client.ui.dd;
 
 import com.vaadin.client.UIDL;

client/src/main/java/com/vaadin/client/ui/dd/VLazyInitItemIdentifiers.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.client.ui.dd;
 
 import java.util.HashSet;

client/src/main/java/com/vaadin/client/ui/dd/VNot.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.client.ui.dd;
 
 import com.vaadin.client.UIDL;

client/src/main/java/com/vaadin/client/ui/dd/VOr.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.client.ui.dd;
 
 import com.vaadin.client.UIDL;

client/src/main/java/com/vaadin/client/ui/dd/VOverTreeNode.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.client.ui.dd;
 
 import com.vaadin.client.UIDL;

client/src/main/java/com/vaadin/client/ui/dd/VServerAccept.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.client.ui.dd;
 
 import com.vaadin.client.UIDL;

client/src/main/java/com/vaadin/client/ui/dd/VSourceIsTarget.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.client.ui.dd;
 
 import com.vaadin.client.ComponentConnector;

client/src/main/java/com/vaadin/client/ui/dd/VTargetDetailIs.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.client.ui.dd;
 
 import com.vaadin.client.UIDL;

compatibility-client/src/main/java/com/vaadin/v7/client/ui/VSlider.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-//
 package com.vaadin.v7.client.ui;
 
 import com.google.gwt.core.client.Scheduler;

compatibility-client/src/main/java/com/vaadin/v7/client/ui/dd/VIsOverId.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.v7.client.ui.dd;
 
 import com.vaadin.client.ComponentConnector;

compatibility-client/src/main/java/com/vaadin/v7/client/ui/dd/VItemIdIs.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.v7.client.ui.dd;
 
 import com.vaadin.client.ComponentConnector;

compatibility-client/src/main/java/com/vaadin/v7/client/ui/tree/VTargetInSubtree.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.v7.client.ui.tree;
 
 import com.google.gwt.user.client.ui.Widget;

server/src/main/java/com/vaadin/event/dd/acceptcriteria/AcceptAll.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.event.dd.acceptcriteria;
 
 import com.vaadin.event.dd.DragAndDropEvent;

server/src/main/java/com/vaadin/event/dd/acceptcriteria/AcceptCriterion.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.event.dd.acceptcriteria;
 
 import java.io.Serializable;

server/src/main/java/com/vaadin/event/dd/acceptcriteria/And.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.event.dd.acceptcriteria;
 
 import com.vaadin.event.dd.DragAndDropEvent;

server/src/main/java/com/vaadin/event/dd/acceptcriteria/ContainsDataFlavor.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.event.dd.acceptcriteria;
 
 import com.vaadin.event.Transferable;

server/src/main/java/com/vaadin/event/dd/acceptcriteria/Not.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.event.dd.acceptcriteria;
 
 import com.vaadin.event.dd.DragAndDropEvent;

server/src/main/java/com/vaadin/event/dd/acceptcriteria/Or.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.event.dd.acceptcriteria;
 
 import com.vaadin.event.dd.DragAndDropEvent;

server/src/main/java/com/vaadin/event/dd/acceptcriteria/SourceIs.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.event.dd.acceptcriteria;
 
 import java.util.logging.Level;

server/src/main/java/com/vaadin/event/dd/acceptcriteria/SourceIsTarget.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.event.dd.acceptcriteria;
 
 import com.vaadin.event.Transferable;

server/src/main/java/com/vaadin/event/dd/acceptcriteria/TargetDetailIs.java

  * License for the specific language governing permissions and limitations under
  * the License.
  */
-/**
- *
- */
 package com.vaadin.event.dd.acceptcriteria;
 
 import com.vaadin.event.dd.DragAndDropEvent;