put people/:id does not seem to work

The docs also seem to be incomplete:
https://docs.followupboss.com/reference#people-id-put

There is no way to specify the id to update to test from the docs page.

https://api.followupboss.com/v1/people/799

I'm also assuming that it is possible to update a single item of the person object without needing to send the entire object. Mainly I'd like to add an email address to an existing person.

Please let me know what I'm doing incorrect. Thanks.