8277074: Qualified exported types show up in JavaDoc

Reviewed-by: psandoz

src/java.base/share/classes/jdk/internal/event/Event.java

@@ -28,6 +28,8 @@
 /**
  * Base class for events, to be subclassed in order to define events and their
  * fields.
+ *
+ * @hidden
  */
 public abstract class Event {
     /**

src/java.base/share/classes/jdk/internal/vm/vector/VectorSupport.java

@@ -150,6 +150,9 @@ public class VectorSupport {
 
     public static class VectorSpecies<E> {}
 
+    /**
+     * @hidden
+     */
     public static class VectorPayload {
         private final Object payload; // array of primitives
 
@@ -162,17 +165,26 @@ protected final Object getPayload() {
         }
     }
 
+    /**
+     * @hidden
+     */
     public static class Vector<E> extends VectorPayload {
         public Vector(Object payload) {
             super(payload);
         }
     }
 
+    /**
+     * @hidden
+     */
     public static class VectorShuffle<E> extends VectorPayload {
         public VectorShuffle(Object payload) {
             super(payload);
         }
     }
+    /**
+     * @hidden
+     */
     public static class VectorMask<E> extends VectorPayload {
         public VectorMask(Object payload) {
             super(payload);