Merge pull request #1977 from sendgrid/eschallock-patch-5

removed link to old article

Author: eschallock

source/Classroom/Track/index.html

@@ -81,7 +81,6 @@ <h2><a href="#Tracking-Unsubscribes">Tracking Unsubscribes</a></h2>
     <div class="col-md-12">
         {% anchor h2 %}Tracking Drops{% endanchor %}
         <ul>
-            <li><a href="{{root_url}}Drops/delivery_rate_drops_rate.html">What does the "Daily delivery rate drops below X%" alert measure?</a></li>
             <li><a href="{{root_url}}Drops/drop_reason_bounced_address.html">Drop Reason&#58; Bounced Address</a></li>
             <li><a href="{{root_url}}Drops/drop_reason_unsubscribed_address.html">Drop Reason&#58; Unsubscribed Address</a></li>
         </ul>