Adding note on phone/email alert policy

gracedb/templates/profile/createNotification.html

@@ -19,6 +19,13 @@
 </ul>
 </div>
 
+<div style="padding: 10px;">
+<h3>Notes</h3>
+<ul>
+    <li>Phone and email notifications will not be issued outside of observing runs, in order to avoid potential accidents.</li>
+</ul>
+</div>
+
 <form method="POST">
     <table>
         {{ form.as_table }}