studio - removing formatting suggestion from label

cms/templates/settings_graders.html

@@ -98,7 +98,7 @@ from contentstore import utils
             <li class="field text" id="field-course-grading-graceperiod">
               <label for="course-grading-graceperiod">Grace Period on Deadline:</label>
               <input type="text" class="short time" id="course-grading-graceperiod" value="0:00" placeholder="HH:MM" autocomplete="off" />
-              <span class="tip tip-inline">Leeway on due dates (using HH:MM format)</span>
+              <span class="tip tip-inline">Leeway on due dates</span>
             </li>
           </ol>
         </section>