qa: Clarify documentation for send_txs_and_test

Author: MarcoFalke

test/functional/test_framework/mininode.py

@@ -559,7 +559,7 @@ def send_txs_and_test(self, txs, rpc, success=True, expect_disconnect=False, rej
 
          - add all txs to our tx_store
          - send tx messages for all txs
-         - if success is True: assert that the txs are accepted to the mempool
+         - if success is True/False: assert that the txs are/are not accepted to the mempool
          - if expect_disconnect is True: Skip the sync with ping
          - if reject_code and reject_reason are set: assert that the correct reject message is received."""