Update GUI with latest helptext

languages/en_US/helptext.txt

@@ -808,7 +808,7 @@ page for that disk.
 :end
 
 :disk_spinup_groups_help:
-If set to 'Yes' then the [Spinup Groups](/Help) feature is enabled.
+If set to 'Yes' then the spinup groups feature is enabled.
 :end
 
 :disk_default_partition_format_help:
@@ -2014,6 +2014,10 @@ Link to a support thread on Lime-Technology's forum.
 Link to the project page (eg: www.plex.tv)
 :end
 
+:docker_client_readme_help:
+Link to a readme file or page
+:end
+
 :docker_client_hub_url_help:
 The path to the container's repository location on the Docker Hub.
 :end