Fix JavaDoc failure

apm-sniffer/apm-sdk-plugin/finagle-6.25.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/finagle/CodecUtils.java

@@ -68,7 +68,6 @@ public class CodecUtils {
      * CarrierItem}, and so on.
      *
      * @param swContextCarrier the swContextCarrier to encode
-     * @return
      */
     static Buf encode(SWContextCarrier swContextCarrier) {
         if (StringUtil.isNotEmpty(swContextCarrier.getOperationName())
@@ -105,7 +104,6 @@ public class CodecUtils {
      * For convenient, we use {@link ByteBuffer} to wrap byte array.
      *
      * @param buf the byte array to decode
-     * @return
      */
     static SWContextCarrier decode(Buf buf) {
         try {