Update java.html

Author: Dinakar2329

java.html

@@ -102,7 +102,7 @@
                     <li>
                       <a class="dropdown-item" href="./java.html">Java</a>
                     </li>
-                    <li><a class="dropdown-item" href="./PHP.html">PHP</a></li>
+                    <li><a class="dropdown-item" href="./php.html">PHP</a></li>
                   </ul>
                 </li>
                 <li class="nav-item dropdown">