updated grading help text on weight of total grade to be more clear that it…

updated grading help text on weight of total grade to be more clear that it should be an integer without the percent sign

cms/templates/js/course_grade_policy.underscore

@@ -14,7 +14,7 @@
   <div class="field text" id="field-course-grading-assignment-gradeweight">
     <label for="course-grading-assignment-gradeweight">Weight of Total Grade</label>
     <input type="text" class="short" id="course-grading-assignment-gradeweight" value = "<%= model.get('weight') %>" />
-    <span class="tip tip-inline">e.g. 25%</span>
+    <span class="tip tip-inline">as a percent, e.g. 40</span>
   </div>
 
   <div class="field text" id="field-course-grading-assignment-totalassignments">