Fix javadoc warnings.

Author: rlubke

src/main/java/com/ning/http/client/AsyncHandler.java

@@ -55,7 +55,7 @@ public static enum STATE {
          */
         CONTINUE,
         /**
-         * Upgrade the protocol. When specified, the AsyncHttpProvider will try to invoke the {@link UpgradeHandler#onReady}
+         * Upgrade the protocol.
          */
         UPGRADE
     }

src/main/java/com/ning/http/client/UpgradeHandler.java

@@ -13,7 +13,7 @@
 package com.ning.http.client;
 
 /**
- * Invoked when an {@link AsyncHandler.STATE#UPGRADE} is returned. Currently the library only support {@link WebSocket}
+ * Invoked when an {@link AsyncHandler.STATE#UPGRADE} is returned. Currently the library only support {@link com.ning.http.client.websocket.WebSocket}
  * as type.
  *
  * @param <T>

src/main/java/com/ning/http/client/filter/FilterContext.java

@@ -73,7 +73,6 @@ public HttpResponseStatus getResponseStatus() {
 
     /**
      * Return the response {@link HttpResponseHeaders}
-     * @return
      */
     public HttpResponseHeaders getResponseHeaders() {
         return b.headers;

src/main/java/com/ning/http/client/websocket/WebSocket.java

@@ -41,7 +41,7 @@ public interface WebSocket {
      * @param offset   starting offset.
      * @param len      length.
      * @param last     flag indicating whether or not this is the last fragment.
-     * @return
+     * @return this.
      */
     WebSocket stream(byte[] fragment, int offset, int len, boolean last);
 

src/main/java/com/ning/http/client/websocket/WebSocketCloseCodeReasonListener.java

@@ -14,7 +14,7 @@
 
 /**
  * Extend the normal close listener with one that support the WebSocket's code and reason.
- * @See http://tools.ietf.org/html/rfc6455#section-5.5.1
+ * @see "http://tools.ietf.org/html/rfc6455#section-5.5.1"
  */
 public interface WebSocketCloseCodeReasonListener {