Wrong path to users page after import

Plugin version 1.10.6.5, file importer.php, line 502

...<?php echo get_admin_url() . '/users.php'; ?>... creates a wrong path to users page like example.com/wp-admin//users.php with two slashes.

Suggested fix: ...<?php echo get_admin_url( null, 'users.php' ); ?>...

Thanks for the great plugin.

One more suggestion, please add the documentation to ww.wp.xz.cn plugin page, not only inside of already installed plugin.