Update typo in docs

Author: puntope

src/Coupon/CouponHelper.php

@@ -378,7 +378,7 @@ public function has_notified_creation( int $coupon_id ): bool {
 		try {
 			$coupon = $this->get_wc_coupon( $coupon_id );
 		} catch ( InvalidValue $e ) {
-			return true; // Sent true for forcing delete notification as the product doesn't exist anymore.
+			return true; // Sent true for forcing delete notification as the coupon doesn't exist anymore.
 		}
 
 		$valid_has_notified_creation_statuses = [

src/Coupon/SyncerHooks.php

@@ -186,7 +186,7 @@ protected function handle_update_coupon( WC_Coupon $coupon ) {
 			return;
 		}
 
-		// Schedule an update job if product sync is enabled.
+		// Schedule an update job if coupon sync is enabled.
 		if ( $this->coupon_helper->is_sync_ready( $coupon ) ) {
 			$this->coupon_helper->mark_as_pending( $coupon );
 			$this->update_coupon_job->schedule(
@@ -300,7 +300,7 @@ protected function maybe_send_delete_notification( int $coupon_id ): void {
 		$coupon = $this->wc->maybe_get_coupon( $coupon_id );
 
 		if ( is_null( $coupon ) ) {
-			// In case product is not anymore in DB we send the notification directly.
+			// In case coupon is not anymore in DB we send the notification directly.
 			$this->notifications_service->notify( NotificationsService::TOPIC_COUPON_DELETED, $coupon_id );
 			return;
 		}