PHPDoc updates

plugins/kolab_auth/kolab_auth.php

@@ -807,6 +807,8 @@ class kolab_auth extends rcube_plugin
 
     /**
      * Initializes LDAP object and connects to LDAP server
+     *
+     * @return ?kolab_ldap Kolab LDAP addressbook
      */
     public static function ldap()
     {

plugins/kolab_delegation/kolab_delegation_engine.php

@@ -223,6 +223,8 @@ class kolab_delegation_engine
 
     /**
      * LDAP object getter
+     *
+     * @return ?kolab_ldap Kolab LDAP addressbook
      */
     private function ldap()
     {

plugins/libkolab/lib/kolab_storage.php

@@ -116,6 +116,8 @@ class kolab_storage
      * Initializes LDAP object to resolve Kolab users
      *
      * @param string $name Name of the configuration option with LDAP config
+     *
+     * @return ?kolab_ldap Kolab LDAP addressbook
      */
     public static function ldap($name = 'kolab_users_directory')
     {