[ignore] Add comments

Author: dizzzz

exist-core/src/test/java/org/exist/storage/CopyCollectionTest.java

@@ -367,6 +367,8 @@ private void copyCol(final Subject execAsUser, final DBBroker.PreserveType prese
                 final Txn transaction = pool.getTransactionManager().beginTransaction();
                 final Collection srcCol = broker.openCollection(src, LockMode.READ_LOCK);
                 final Collection destCol = broker.openCollection(dest.removeLastSegment(), LockMode.WRITE_LOCK)) {
+
+            // Wait a moment to ensure both resources have a different timestamp.
             Thread.sleep(10);
             broker.copyCollection(transaction, srcCol, destCol, dest.lastSegment(), preserve);