Fix exception message

Author: tvdijen

src/XML/ds/SignatureMethod.php

@@ -70,7 +70,7 @@ private function setAlgorithm(string $algorithm): void
                 Constants::SIG_HMAC_SHA512,
                 Constants::SIG_HMAC_RIPEMD160,
             ],
-            'Invalid canonicalization method',
+            'Invalid signature method',
             InvalidArgumentException::class
         );