Merge branch 'brodock/document-gitlab-shell' into 'master'

Add documentation to Gitlab::Shell

See merge request gitlab-org/gitlab!23388

app/models/key.rb

@@ -96,8 +96,7 @@ class Key < ApplicationRecord
   def remove_from_shell
     GitlabShellWorker.perform_async(
       :remove_key,
-      shell_id,
-      key
+      shell_id
     )
   end
 

spec/models/key_spec.rb

@@ -189,7 +189,7 @@ describe Key, :mailer do
 
     it 'removes key from authorized_file' do
       key = create(:personal_key)
-      expect(GitlabShellWorker).to receive(:perform_async).with(:remove_key, key.shell_id, key.key)
+      expect(GitlabShellWorker).to receive(:perform_async).with(:remove_key, key.shell_id)
       key.destroy
     end
   end