Fix typo in exception documentation comment

Author: eileenmcnaughton

tests/phpunit/BillingFieldsTest.php

@@ -38,7 +38,6 @@ public function setUpHeadless(): \Civi\Test\CiviEnvBuilder {
    * Setup for test.
    *
    * @throws \CRM_Core_Exception
-   * @throws \CRM_Csore_Exception
    */
   public function setUp():void {
     parent::setUp();