Update learn/cascade/specificity-boxes.html

Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org>

Author: estelle

learn/cascade/specificity-boxes.html

@@ -10,7 +10,7 @@
     </style>
 
     <style class="editable">
-/* specificity: 1-0-1 */
+/* 1. specificity: 1-0-1 */
 #outer a {
   background-color: red;
 }