Make the descriptions of permissions_validity_in_ms, permissions_update_interval_in_ms and permissions_cache_max_entries more readable and more related to what they really do. Mention the none-zero value requirement for the permissions_update_interval_in_ms and the permissions_cache_max_entries when the permissions cache is enabled. Adjust the parameters description in the scylla.yaml too. Signed-off-by: Vlad Zolotarov <vladz@scylladb.com> Message-Id: <1499957053-31792-1-git-send-email-vladz@scylladb.com>