Adjust check-if-preregistered page wording

Fixes https://jira.magfest.net/browse/MAGDEV-354.

uber/templates/preregistration/check_if_preregistered.html

@@ -5,10 +5,9 @@
 {% include 'prereg_masthead.html' %}
 <div class="panel panel-default">
   <div class="panel-body">
-    <h2>Check Preregistration</h2>
+    <h2>Resend Registration Page Link</h2>
     <p>
-      If for any reason you are unsure that you're preregistered for {{ c.EVENT_NAME_AND_YEAR }}, please enter your email
-      address below.
+      If you would like to update your registration page, adjust kick-in perks, or if you’re unsure if you pre-registered for MAGFest 2019, enter your email address below to receive a link to your registration page.
     </p>
     <p>
       If you are pre-registered, you will receive a confirmation email (usually within 5 minutes). If you do not