Fix web-eid.eu page link for PHP example

WE2-1026

Signed-off-by: Sven Mitt <[email protected]>

Author: svenzik

example/src/main/resources/templates/index.html

@@ -236,7 +236,7 @@ <h3><a id="for-developers"></a>For developers</h3>
                 The .NET/C# version of the example is available
                 <a href="https://github.com/web-eid/web-eid-asp-dotnet-example">here</a>.
                 The PHP version of the example is available
-                <a href="https://github.com/web-eid/web-eid-authtoken-validation-php/tree/main/examples">here</a>.
+                <a href="https://github.com/web-eid/web-eid-authtoken-validation-php/tree/main/example">here</a>.
             </p>
         </div>
     </div>