Update monitor.js (#2929)

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server/model/monitor.js

@@ -1265,7 +1265,7 @@ class Monitor extends BeanModel {
             for (let notification of notificationList) {
                 try {
                     log.debug("monitor", "Sending to " + notification.name);
-                    await Notification.send(JSON.parse(notification.config), `[${this.name}][${this.url}] Certificate will be expired in ${daysRemaining} days`);
+                    await Notification.send(JSON.parse(notification.config), `[${this.name}][${this.url}] Certificate will expire in ${daysRemaining} days`);
                     sent = true;
                 } catch (e) {
                     log.error("monitor", "Cannot send cert notification to " + notification.name);