Dashboard "Right Now" widget hook should be right_now_end, not rightnow_end

[schreifels]

In /wp-admin/includes/dashboard.php , the following callback is used:

do_action( 'rightnow_end' );

However, ​the documentation and logic (for consistency with right_now_content_table_end, right_now_table_end, etc) would tell us that the hook should actually be called right_now_end.