You are right that for some reason, the PolicyObject Endpoint doesn't exist in the API Documentation on http://developer.cisco.com/meraki.
However, if you browse to the "old API documentation" you can actually find the endpoint there. When you're logged in to your Dashboard, click on Help -> API Docs.
There, browse down to Policy Objects. Previously they were known as Network Objects, but that API is deprecated. Now it's called PolicyObject - just like the endpoint that you have found yourself.
It's not optimal that Meraki has two different API Documentations and that they are not alligned. Hopfully that is something, Meraki will get fixed. Perhaps @MeredithW can help with poking the right people?
Anyhow, make sure to keep in mind to check both API Docs - the one at developer.cisco.com, and Meraki's own under the Help tab.
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