Fix grammar in docs

diff --git a/lightning-invoice/src/lib.rs b/lightning-invoice/src/lib.rs
index 8ccd9d979ab139899731d3724566b0b12e27069d..454a67f635205c5269edfd5b802dd9bce0fccbba 100644 (file)
--- a/lightning-invoice/src/lib.rs
+++ b/lightning-invoice/src/lib.rs
@@ -1148,7 +1148,7 @@ impl Invoice {
                self.signed_invoice.hash
        }
 
-       /// Transform the `Invoice` into it's unchecked version
+       /// Transform the `Invoice` into its unchecked version.
        pub fn into_signed_raw(self) -> SignedRawInvoice {
                self.signed_invoice
        }