Merge branch 'k-github-ee' into 'master'

added info about GitHub importing

Added info that importing doc also works for GitHub EE.

https://dev.gitlab.org/gitlab/gitlabhq/issues/2410#note_49396

See merge request !1878

doc/workflow/importing/import_projects_from_github.md

@@ -3,6 +3,8 @@
 It takes just a couple of steps to import your existing GitHub projects to GitLab. Keep in mind that it is possible only if
 GitHub support is enabled on your GitLab instance. You can read more about GitHub support [here](http://doc.gitlab.com/ce/integration/github.html)
 
+If you want to import from a GitHub Enterprise instance, you need to use GitLab Enterprise; please see the [EE docs for the GitHub integration](http://doc.gitlab.com/ee/integration/github.html).
+
 * Sign in to GitLab.com and go to your dashboard.
 * To get to the importer page, you need to go to the "New project" page.