Correct typo in community draft tracking subscription confirmation email.

 - Legacy-Id: 4538

Author: levkowetz

ietf/templates/community/public/subscribe.html

@@ -6,7 +6,7 @@
 <h1>Subscribe to {{ cl.long_name }}</h1>
 {% if success %}
 <p>
-We have sent and email to your email address with instructions to complete your subscription.
+We have sent an email to your email address with instructions to complete your subscription.
 </p>
 {% else %}
 <p>