Update readme

Author: thespad

readme-vars.yml

@@ -5,5 +5,5 @@ project_name: rdesktop
 project_lsio_github_repo_url: "https://github.com/linuxserver/docker-{{ project_name }}"
 full_custom_readme: |
   {% raw -%}
-  Up to date documentation is available [here](https://github.com/linuxserver/docker-rdesktop/blob/master/README.md).
+  Up to date documentation is available [here](https://github.com/linuxserver/docker-rdesktop/blob/ubuntu-xfce/README.md).
   {%- endraw %}