Update lightning-invoice/src/utils.rs

Co-authored-by: dunxen <[email protected]>

Author: ssbright

lightning-invoice/src/utils.rs

@@ -354,8 +354,9 @@ fn _create_invoice_from_channelmanager_and_duration_since_epoch<M: Deref, T: Der
 }
 
 /// See [`create_invoice_from_channelmanager_and_duration_since_epoch`]
-///Function that allows to construct invoices with the given payment hash.
-///This may be useful if you're building an on-chain swap or integrating with another protocol where the payment hash is fixed outside of lightning.
+/// This version allows for providing a custom [`PaymentHash`] for the invoice.
+/// This may be useful if you're building an on-chain swap or involving another protocol where
+/// the payment hash is also involved outside the scope of lightning.
 pub fn create_invoice_from_channelmanager_and_duration_since_epoch_with_payment_hash<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>(
 	channelmanager: &ChannelManager<M, T, K, F, L>, keys_manager: K, logger: L,
 	network: Currency, amt_msat: Option<u64>, description: String, duration_since_epoch: Duration,