Fixes after release

Adding in a link about the deprecated material
Fixing bad link to staging

Signed-off-by: Mary Anthony <mary@docker.com>

docs/reference/api/hub_registry_spec.md

@@ -0,0 +1,17 @@
+<!--[metadata]>
++++
+title = "The Docker Hub and the Registry v1"
+description = "Documentation for docker Registry and Registry API"
+keywords = ["docker, registry, api,  hub"]
+[menu.main]
+parent="smn_hub_ref"
++++
+<![end-metadata]-->
+
+# The Docker Hub and the Registry v1
+
+This API is deprecated as of 1.7. To view the old version, see the [go
+here](http://docs.docker.com/v1.7/reference/api/hub_registry_spec/) in
+the 1.7 documentation. If you want an overview of the current features in
+Docker Hub or other image management features see the [image management
+overview](/userguide/image_management/) in the current documentation set.