fix: updated text for info banner

cms/templates/course_outline.html

@@ -73,7 +73,7 @@ from django.urls import reverse
       <div class="copy">
         <div style="color:black; display:inline-block">
             <div>
-                ${_("This course run is using an upgraded version of edx discussion forum. Discussion xblocks will no longer work.")}
+                ${_("This course run is using an upgraded version of edx discussion forum. In order to display the discussions sidebar, discussions xBlocks will no longer be visible to learners.")}
             </div>
             <div style="margin-left:auto; width:fit-content;">
                 <span>