core: fixed stale comment in txlist (ethereum#23825)

Author: MariusVanDerWijden

core/tx_list.go

@@ -295,9 +295,9 @@ func (l *txList) Add(tx *types.Transaction, priceBump uint64) (bool, *types.Tran
 		thresholdFeeCap := aFeeCap.Div(aFeeCap, b)
 		thresholdTip := aTip.Div(aTip, b)
 
-		// Have to ensure that either the new fee cap or tip is higher than the
+		// We have to ensure that both the new fee cap and tip are higher than the
 		// old ones as well as checking the percentage threshold to ensure that
-		// this is accurate for low (Wei-level) gas price replacements
+		// this is accurate for low (Wei-level) gas price replacements.
 		if tx.GasFeeCapIntCmp(thresholdFeeCap) < 0 || tx.GasTipCapIntCmp(thresholdTip) < 0 {
 			return false, nil
 		}