link added to pre-authentication documentation

src/realms/yanel-website/data-repo/data/en/documentation/index.html

@@ -86,7 +86,7 @@ <h1>Documentation</h1>
 <li><a href="security/overview.html">Overview</a></li>
 <li><a href="security/access-policies.html">Access Control Policies</a></li>
 <li><a href="security/login-screen-customization.html">Login Screen Customization</a></li>
-<li>Pre-authentication</li>
+<li><a href="security/pre-authentication.html">Pre-authentication</a></li>
 <li><a href="security/ssl.html">SSL</a></li>
 <li><a href="security/custom-identity-manager-custom-policy-manager.html">Custom IdentityManager, custom PolicyManager and custom WebAuthenticator</a></li>
 <li><a href="security/sso-using-cas.html">Single sign-on (SSO) using CAS</a></li>