docblock update

CRM/Core/Payment/MJWIPNTrait.php

@@ -510,7 +510,6 @@ trait CRM_Core_Payment_MJWIPNTrait {
    * @param array $params
    *
    * @throws \CRM_Core_Exception
-   * @throws \CRM_Core_Exception
    */
   protected function updateContributionRefund($params) {
     $this->checkRequiredParams('updateContributionRefund', ['contribution_id', 'total_amount'], $params);