Add comment to explain side effect import

app/assets/javascripts/pages/groups/settings/repository/create_deploy_token/index.js

+// This "page" is only rendered as response to the create_deploy_token form.
+// It shows the secret token to the user one time, but is otherwise identical
+// with the Settings/Repository page.
+//
+// This is why we just import the other page's JavaScript here.
 import '../show/index';