Fix ISO 4712 typo to ISO 4217

Author: andrei-21

lightning/src/offers/offer.rs

@@ -1028,16 +1028,16 @@ pub enum Amount {
 		/// The amount in millisatoshi.
 		amount_msats: u64,
 	},
-	/// An amount of currency specified using ISO 4712.
+	/// An amount of currency specified using ISO 4217.
 	Currency {
 		/// The currency that the amount is denominated in.
 		iso4217_code: CurrencyCode,
-		/// The amount in the currency unit adjusted by the ISO 4712 exponent (e.g., USD cents).
+		/// The amount in the currency unit adjusted by the ISO 4217 exponent (e.g., USD cents).
 		amount: u64,
 	},
 }
 
-/// An ISO 4712 three-letter currency code (e.g., USD).
+/// An ISO 4217 three-letter currency code (e.g., USD).
 pub type CurrencyCode = [u8; 3];
 
 /// Quantity of items supported by an [`Offer`].

lightning/src/util/ser.rs

@@ -664,7 +664,7 @@ macro_rules! impl_array {
 	);
 }
 
-impl_array!(3, u8); // for rgb, ISO 4712 code
+impl_array!(3, u8); // for rgb, ISO 4217 code
 impl_array!(4, u8); // for IPv4
 impl_array!(12, u8); // for OnionV2
 impl_array!(16, u8); // for IPv6