Update index.html

Author: kothakokila

index.html

@@ -9,7 +9,7 @@
     <h1>Welcome to JavaScript Games Collection</h1>
     <ul>
         <li><a href="RockPaperScissor/index.html">Rock Paper Scissors</a></li>
-        <li><a href="Tic Tac Toe/index.html">Tic Tac Toe</a></li>
+        <li><a href="Tic_Tac_Toe/index.html">Tic Tac Toe</a></li>
     </ul>
 </body>
 </html>