Wrong default polling time listed in Telemetry best practices in ceilometer

[William Konitzer]

https://docs.openstack.org/ceilometer/pike/admin/telemetry-best-practices.html

Doc says the following:
By default, Telemetry service polls the service APIs every 10 minutes. You can change the polling interval on a per meter basis by editing the polling.yaml configuration file.

but when I look at the file it's set to 300s, or 5 mins.
https://github.com/openstack/ceilometer/blob/stable/pike/etc/ceilometer/polling.yaml

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-----------------------------------
Release: 9.0.7.dev2 on 2019-01-14 16:03
SHA: b554dc3e29c780d037050c9b92d169b2a134ab4b
Source: https://git.openstack.org/cgit/openstack/ceilometer/tree/doc/source/admin/telemetry-best-practices.rst
URL: https://docs.openstack.org/ceilometer/pike/admin/telemetry-best-practices.html