Added subscription note

Added note that such a LDAP proxy setup is not part of our subscription services.

modules/admin_manual/pages/configuration/ldap/ldap_proxy_cache_server_setup.adoc

@@ -33,7 +33,7 @@ To set up the LDAP Proxy-Cache server work through the following five steps:
 There are a number of {list-of-ldap-url}[LDAP server implementations] available. 
 The one used in this guide is {open-ldap-url}[OpenLDAP].
 
-NOTE: While OpenLDAP does work on most of the common operating systems, for the purposes of this guide we'll be using a Debian-based Linux distribution.
+NOTE: While OpenLDAP does work on most of the common operating systems, for the purposes of this guide we'll be using a Debian-based Linux distribution. We do provide this guide as example only, the configuration of the LDAP Proxy is not part of any ownCloud subscription - we recommend to reach out to your Linux vendor for support or ask for ownCloud Consulting Services or an ownCloud Partner to help with such a setup.
 
 First, update your system to ensure that you are using the latest packages.
 Then, run the following command: