Typo

server/index.gohtml

@@ -198,7 +198,7 @@
             curl -d "Backup failed" <span id="detailTopicUrl">ntfy.sh/topic</span>
         </code>
         <p id="detailNotificationsDisallowed">
-            If you'd like to receive desktop notifications when new messages arrive on this topic, you have
+            If you'd like to receive desktop notifications when new messages arrive on this topic, you have to
             <a href="#" onclick="return requestPermission()">grant the browser permission</a> to show notifications.
             Click the link to do so.
         </p>