Update src/java/org/apache/cassandra/index/sai/metrics/TableQueryMetrics.java

Fix javadoc

Co-authored-by: ekaterinadimitrova2 <[email protected]>

Author: pkolaczk

src/java/org/apache/cassandra/index/sai/metrics/TableQueryMetrics.java

@@ -320,7 +320,7 @@ public static class PerQuery extends AbstractQueryMetrics
         /** Number of rows to be fetched by the query as estimated by the planner */
         public final Histogram rowsToFetchEstimated;
 
-        /** Number of rows to be fetched by the query as estimated by the planner */
+        /** Number of keys to be iterated by the query as estimated by the planner */
         public final Histogram keysToIterateEstimated;
 
         /**