Update homepage copy

app/views/home/index.html.erb

@@ -8,7 +8,7 @@
 <div class="row center">
   <div class="col-lg-4">
     <h3>Create A "Switch"</h3>
-    <p>A switch is a set of data you want saved. You configure settings to specify how often you should be sent heartbeats and how many should be missed before you are considered unresponsive.</p>
+    <p>A switch is a set of data you want saved. You specify a list of email addresses that should be sent your switch's data if you become unresponsive.</p>
   </div>
   <div class="col-lg-4">
     <h3>Receive "Heartbeats"</h3>