fix GatewayInterface phpdocs

Author: tgabi333

src/Omnipay/Common/GatewayInterface.php

@@ -13,25 +13,25 @@
  *
  * @see AbstractGateway
  *
- * @method \Omnipay\Common\Message\ResponseInterface authorize(array $options = array())         (Optional method)
+ * @method \Omnipay\Common\Message\RequestInterface authorize(array $options = array())         (Optional method)
  *         Authorize an amount on the customers card
- * @method \Omnipay\Common\Message\ResponseInterface completeAuthorize(array $options = array()) (Optional method)
+ * @method \Omnipay\Common\Message\RequestInterface completeAuthorize(array $options = array()) (Optional method)
  *         Handle return from off-site gateways after authorization
- * @method \Omnipay\Common\Message\ResponseInterface capture(array $options = array())           (Optional method)
+ * @method \Omnipay\Common\Message\RequestInterface capture(array $options = array())           (Optional method)
  *         Capture an amount you have previously authorized
- * @method \Omnipay\Common\Message\ResponseInterface purchase(array $options = array())          (Optional method)
+ * @method \Omnipay\Common\Message\RequestInterface purchase(array $options = array())          (Optional method)
  *         Authorize and immediately capture an amount on the customers card
- * @method \Omnipay\Common\Message\ResponseInterface completePurchase(array $options = array())  (Optional method)
+ * @method \Omnipay\Common\Message\RequestInterface completePurchase(array $options = array())  (Optional method)
  *         Handle return from off-site gateways after purchase
- * @method \Omnipay\Common\Message\ResponseInterface refund(array $options = array())            (Optional method)
+ * @method \Omnipay\Common\Message\RequestInterface refund(array $options = array())            (Optional method)
  *         Refund an already processed transaction
- * @method \Omnipay\Common\Message\ResponseInterface void(array $options = array())              (Optional method)
+ * @method \Omnipay\Common\Message\RequestInterface void(array $options = array())              (Optional method)
  *         Generally can only be called up to 24 hours after submitting a transaction
- * @method \Omnipay\Common\Message\ResponseInterface createCard(array $options = array())        (Optional method)
+ * @method \Omnipay\Common\Message\RequestInterface createCard(array $options = array())        (Optional method)
  *         The returned response object includes a cardReference, which can be used for future transactions
- * @method \Omnipay\Common\Message\ResponseInterface updateCard(array $options = array())        (Optional method)
+ * @method \Omnipay\Common\Message\RequestInterface updateCard(array $options = array())        (Optional method)
  *         Update a stored card
- * @method \Omnipay\Common\Message\ResponseInterface deleteCard(array $options = array())        (Optional method)
+ * @method \Omnipay\Common\Message\RequestInterface deleteCard(array $options = array())        (Optional method)
  *         Delete a stored card
 */
 interface GatewayInterface