f - docs fixes

Author: jkczyz

lightning/src/offers/offer.rs

@@ -25,9 +25,9 @@ use std::time::SystemTime;
 
 /// An `Offer` is a potentially long-lived proposal for payment of a good or service.
 ///
-/// An offer is precursor to an `InvoiceRequest`. A merchant publishes an offer from which a
-/// customer may request an `Invoice` for a specific quantity and using an amount enough to cover
-/// that quantity (i.e., at least `quantity * amount`). See [`Offer::amount`].
+/// An offer is a precursor to an `InvoiceRequest`. A merchant publishes an offer from which a
+/// customer may request an `Invoice` for a specific quantity and using an amount sufficient to
+/// cover that quantity (i.e., at least `quantity * amount`). See [`Offer::amount`].
 ///
 /// Offers may be denominated in currency other than bitcoin but are ultimately paid using the
 /// latter.