Minor documentation update for SignatureInvalidException

Author: Brendan Abbott

Authentication/JWT.php

@@ -30,11 +30,13 @@ class JWT
      * @param bool        $verify    Don't skip verification process
      *
      * @return object      The JWT's payload as a PHP object
-     * @throws DomainException          Algorithm was not provided
-     * @throws UnexpectedValueException Provided JWT was invalid
-     * @throws BeforeValidException     Provided JWT is trying to be used before it's eligible as defined by 'nbf'
-     * @throws BeforeValidException     Provided JWT is trying to be used before it's been created as defined by 'iat'
-     * @throws ExpiredException         Provided JWT has since expired, as defined by the 'exp' claim
+     *
+     * @throws DomainException              Algorithm was not provided
+     * @throws UnexpectedValueException     Provided JWT was invalid
+     * @throws SignatureInvalidException    Provided JWT was invalid because the signature verification failed
+     * @throws BeforeValidException         Provided JWT is trying to be used before it's eligible as defined by 'nbf'
+     * @throws BeforeValidException         Provided JWT is trying to be used before it's been created as defined by 'iat'
+     * @throws ExpiredException             Provided JWT has since expired, as defined by the 'exp' claim
      *
      * @uses jsonDecode
      * @uses urlsafeB64Decode