Incomplete import in documentation: Plugins/Activity missing needed import

[thanateros]

On this documentation page Plugins/Activity there is a missing import statement -- It says to import Admin, but neglects to mention that one also needs to be an import of :

"github.com/qor/activity"

or the example in the mentioned documentation will not work.

I would have put this as a comment in the documentation feedback but could find no way to report the error on the documentation website.