Spelling error. Added "Alpha"

templates/gracedb/index.html

 {% extends "base.html" %}
 
 {% block title %}Home{% endblock %}
-{% block heading %}GraceDB — Overview{% endblock %}
+{% block heading %}GraceDB <em>Alpha</em> &mdash; Overview{% endblock %}
 {% block pageid %}home{% endblock %}
 
 {% block content %}
@@ -19,7 +19,7 @@ You can read about using the service at the
 </div>
 
 <div class="text">
-To receieve email alerts when GraCEDb events are created, sign up
+To receive email alerts when GraCEDb events are created, sign up
 on the <a target="_blank" href="http://listserv.ligo.org/cgi-bin/mailman/listinfo/gracedb">gracedb mailing list</a>.
 </div>