Fix typos (#11914)

substrate/frame/transaction-payment/src/lib.rs

@@ -609,7 +609,7 @@ where
 	/// and user-included tip.
 	///
 	/// The priority is based on the amount of `tip` the user is willing to pay per unit of either
-	/// `weight` or `length`, depending which one is more limitting. For `Operational` extrinsics
+	/// `weight` or `length`, depending which one is more limiting. For `Operational` extrinsics
 	/// we add a "virtual tip" to the calculations.
 	///
 	/// The formula should simply be `tip / bounded_{weight|length}`, but since we are using