Fixed typo mistake in link name.

Author: sanganinamrata

guides/v2.3/index.html

@@ -60,7 +60,7 @@ <h2 class="title">Magento APIs</h2>
         <li><a href="{{ page.baseurl }}/get-started/bk-get-started-api.html">Get Started with Magento APIs</a></li>
         <li><a href="{{ page.baseurl }}/rest/bk-rest.html">REST API Reference (Static)</a></li>
         <li><a href="{{ page.baseurl }}/rest/generate-local.html">REST API Reference (Local)</a></li>
-        <li><a href="{{ page.baseurl }}/graphql/index.html">GraphQL Deverloper Guide (New!)</a></li>
+        <li><a href="{{ page.baseurl }}/graphql/index.html">GraphQL Developer Guide (New!)</a></li>
       </ul>
     </div>