RHIDP-4840 - Fix broken link (#853)

Author: themr0c

modules/authorization/proc-enabling-the-rbac-plugin.adoc

@@ -8,7 +8,7 @@ The permission policies for users and groups in the {product-short} are managed
 
 .Prerequisites
 * You have link:{linkadminguide}#assembly-add-custom-app-file-openshift_admin-rhdh[added a custom {product-short} application configuration], and have sufficient permissions to modify it.
-* You have link:{authentication-book-title}[enabled an authentication provider].
+* You have link:{authentication-book-url}[enabled an authentication provider].
 
 .Procedure
 . The RBAC plugin is installed but disabled by default.