Link to Registry docs from project settings

app/views/projects/edit.html.haml

@@ -100,7 +100,8 @@
                   = f.check_box :container_registry_enabled
                   %strong Container Registry
                   %br
-                  %span.descr Enable Container Registry for this repository
+                  %span.descr Enable Container Registry for this project
+                  = link_to icon('question-circle'), help_page_path('user/project/container_registry'), target: '_blank'
 
         = render 'merge_request_settings', f: f
         %hr