Are you really looking at Moodle 1.9 documentation? For 3.5 it is https://docs.moodle.org/35/en/Cron.
Watch out: There is a difference in path: /path/to/moodle/admin/cron.php in 1.9 and and /path/to/moodle/admin/cli/cron.php since 2.x.
General developer forum
cron not running automatic
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