func: cleanup test_dustrelay comments

Author: instagibbs

test/functional/mempool_dust.py

@@ -78,8 +78,8 @@ def test_dustrelay(self):
 
         assert_equal(self.nodes[0].getrawmempool(), [])
 
-        # Double dust, both unspent, with fees. Would have failed individual checks.
-        # Dust is 1 satoshi create_self_transfer_multi disallows 0
+        # Create two dust outputs. Transaction has zero fees. both dust outputs are unspent, and would have failed individual checks.
+        # The amount is 1 satoshi because create_self_transfer_multi disallows 0.
         dusty_tx = self.wallet.create_self_transfer_multi(fee_per_output=1000, amount_per_output=1, num_outputs=2)
         dust_txid = self.nodes[0].sendrawtransaction(hexstring=dusty_tx["hex"], maxfeerate=0)