refactor: remove wrong comment in test_tx_fees.py

Author: mkoura

cardano_node_tests/tests/test_tx_fees.py

@@ -247,7 +247,6 @@ def _create_pool_certificates(
 
         src_address = pool_owners[0].payment.address
 
-        # Register and delegate stake address, create and register pool
         tx_files = clusterlib.TxFiles(
             certificate_files=[
                 pool_reg_cert_file,