remove redundant comment

Author: Vladimir Kotal

opengrok-indexer/src/main/java/org/opengrok/indexer/history/FileHistoryCache.java

@@ -496,7 +496,6 @@ public void store(History history, Repository repository, String tillRevision) t
 
         // Wait for the executors to finish.
         try {
-            // Wait for the executors to finish.
             latch.await();
         } catch (InterruptedException ex) {
             LOGGER.log(Level.SEVERE, "latch exception", ex);