Update 16_cron_jobs.rst
cart_to_shelf.pl -- removed perldoc check-url.pl -- removed perldoc automatic_item_modification_by_age.pl -- removed perldoc cloud-kw.pl -- removed perldoc cleanup_database.pl -- removed perldoc
cart_to_shelf.pl -- removed perldoc check-url.pl -- removed perldoc automatic_item_modification_by_age.pl -- removed perldoc cloud-kw.pl -- removed perldoc cleanup_database.pl -- removed perldoc