HBASE-22042 Missing @Override annotation for RawAsyncTableImpl.scan

Signed-off-by: zhangduo <zhangduo@apache.org>

hbase-client/src/main/java/org/apache/hadoop/hbase/client/RawAsyncTableImpl.java

@@ -436,6 +436,7 @@ class RawAsyncTableImpl implements AsyncTable<AdvancedScanResultConsumer> {
     return newScan;
   }
 
+  @Override
   public void scan(Scan scan, AdvancedScanResultConsumer consumer) {
     new AsyncClientScanner(setDefaultScanConfig(scan), consumer, tableName, conn, retryTimer,
       pauseNs, maxAttempts, scanTimeoutNs, readRpcTimeoutNs, startLogErrorsCnt).start();