Fix home page description of service

gracedb/templates/gracedb/index.html

@@ -81,7 +81,7 @@ body {
 {% if information %}
     {{ information|safe }}
 {% else %}
-    <p>The gravitational-wave candidate event database (GraceDB) is a prototype system to organize candidate events from gravitational-wave searches and to provide an environment to record information about follow-ups.</p>
+    <p>The gravitational-wave candidate event database (GraceDB) is a service which organizes candidate events from gravitational-wave searches and provides an environment to record information about follow-ups.</p>
     <ul>
     <li><a href="https://wiki.ligo.org/Computing/GraceDB">Project page on wiki.ligo.org</a></li>
     <li><a href="{% url "legacy_apiweb:default:root" %}">Browseable REST API</a>