Remove "Supported Docker versions" quick reference bit

This really hasn't been horribly relevant for a long time (it was more relevant back when Docker was more frequently making breaking changes to things like image format and those have all been very calm for years now).

.template-helpers/template.md

@@ -27,7 +27,4 @@
 -	**Source of this description**:  
 	[docs repo's `%%REPO%%/` directory](https://github.com/docker-library/docs/tree/master/%%REPO%%) ([history](https://github.com/docker-library/docs/commits/master/%%REPO%%))
 
--	**Supported Docker versions**:  
-	[the latest release](https://github.com/docker/docker-ce/releases/latest) (down to 1.6 on a best-effort basis)
-
 %%CONTENT%%%%VARIANT%%%%LICENSE%%