fixed a comment

Author: sayopaul

src/Paystack.php

@@ -102,6 +102,7 @@ private function setRequestOptions()
 
 
      /**
+     * Initiate a payment request to Paystack
      * Included the option to pass the payload to this method for situations 
      * when the payload is built on the fly (not passed to the controller from a view)
      * @return Paystack