Fix incorrect protocol description in FlowRequestData writer/decoder (#1607)

Signed-off-by: yunfeiyanggzq <yunfeiyang@buaa.edu.cn>

sentinel-cluster/sentinel-cluster-client-default/src/main/java/com/alibaba/csp/sentinel/cluster/client/codec/data/FlowRequestDataWriter.java

@@ -22,7 +22,7 @@ import io.netty.buffer.ByteBuf;
 
 /**
  * +-------------------+--------------+----------------+---------------+------------------+
- * | RequestID(8 byte) | Type(1 byte) | FlowID(4 byte) | Count(4 byte) | PriorityFlag (1) |
+ * | RequestID(8 byte) | Type(1 byte) | FlowID(8 byte) | Count(4 byte) | PriorityFlag (1) |
  * +-------------------+--------------+----------------+---------------+------------------+
  *
  * @author Eric Zhao

sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/server/codec/data/FlowRequestDataDecoder.java

@@ -25,7 +25,7 @@ import io.netty.buffer.ByteBuf;
  * Decoder for {@link FlowRequestData} from {@code ByteBuf} stream. The layout:
  * </p>
  * <pre>
- * | flow ID (4) | count (4) | priority flag (1) |
+ * | flow ID (8) | count (4) | priority flag (1) |
  * </pre>
  *
  * @author Eric Zhao