f - expand payer_note docs

Author: jkczyz

lightning/src/offers/invoice_request.rs

@@ -139,7 +139,8 @@ impl<'a> InvoiceRequestBuilder<'a> {
 		self
 	}
 
-	/// Sets a note for the invoice request.
+	/// Sets a payer-defined note which will be seen by recipient and reflected in the invoice
+	/// response.
 	///
 	/// Successive calls to this method will override the previous setting.
 	pub fn payer_note(mut self, payer_note: String) -> Self {
@@ -292,7 +293,7 @@ impl InvoiceRequest {
 		self.contents.payer_id
 	}
 
-	/// Payer provided note to include in the invoice.
+	/// Payer-provided note to include in the invoice.
 	pub fn payer_note(&self) -> Option<PrintableString> {
 		self.contents.payer_note.as_ref().map(|payer_note| PrintableString(payer_note.as_str()))
 	}