Add in Mark's copy changes.

cms/templates/settings_advanced.html

@@ -60,8 +60,7 @@ editor.render();
             <span class="tip">Manually Edit Course Policy Values (JSON Key / Value pairs)</span>
           </header>
 
-          <p class="instructions"><strong>Warning</strong>: Add only manual policy data that you are familiar
-          with.</p>
+          <p class="instructions"><strong>Warning</strong>: Do not modify these policies unless you are familiar with their purpose.</p>
 
           <ul class="list-input course-advanced-policy-list enum">
               
@@ -73,9 +72,9 @@ editor.render();
     <aside class="content-supplementary" role="complimentary">
       <div class="bit">
         <h3 class="title-3">How will these settings be used?</h3>
-        <p>Manual policies are JSON-based key and value pairs that allow you add additional settings which edX Studio will use when generating your course.</p>
+        <p>Manual policies are JSON-based key and value pairs that give you control over specific course settings that edX Studio will use when displaying and running your course.</p>
 
-        <p>Any policies you define here will override any other information you've defined elsewhere in Studio. With this in mind, please be very careful and do not add policies that you are unfamiliar with (both their purpose and their syntax).</p>
+        <p>Any policies you modify here will override any other information you've defined elsewhere in Studio. With this in mind, please be very careful and do not edit policies that you are unfamiliar with (both their purpose and their syntax).</p>
       </div>
 
       <div class="bit">