[hotfix] Remove duplicate java doc for flink sink (#977)

Author: Tartarus0zm

fluss-flink/fluss-flink-common/src/main/java/com/alibaba/fluss/flink/sink/FlinkSink.java

@@ -43,7 +43,6 @@
 import static com.alibaba.fluss.flink.sink.FlinkStreamPartitioner.partition;
 import static com.alibaba.fluss.flink.utils.FlinkConversions.toFlussRowType;
 
-/** Flink sink for Fluss. */
 /** Flink sink for Fluss. */
 class FlinkSink<InputT> implements Sink<InputT>, SupportsPreWriteTopology<InputT> {