Fixed WooCommerce coupon description not set issue.

Author: malayladu

gravity-forms/gw-create-coupon.php

@@ -190,10 +190,10 @@ public function create_coupon_wc( $coupon_name, $coupon_code, $amount, $type, $e
 			$start_date = $date->format( 'Y-m-d H:i:s' );
 		}
 
-		// WooCommerce coupon uses the Post Title as the coupon code hence $coupon_code is assigned to Post Title and $coupon_name is assigned to the Post Content
+		// WooCommerce coupon uses the Post Title as the coupon code hence $coupon_code is assigned to Post Title and $coupon_name is assigned to the Post Excerpt
 		$coupon = array(
 			'post_title'   => $coupon_code,
-			'post_content' => $coupon_name,
+			'post_excerpt' => $coupon_name,
 			'post_status'  => 'publish',
 			'post_author'  => 1,
 			'post_type'    => 'shop_coupon',