Beginning of REST API documentation. Added info for /hosts endpoint.#29

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noahtalerman merged 7 commits intofleetdm:masterfrom

noahtalerman:metrics-docs

Nov 12, 2020

Commits on Nov 11, 2020

Added answer stub in updating fleet docs to answer user question. Also created rest-endpoint page in docs to document answers to users' questions about the api.
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Updated rest-endpoints page with more filled out information for /hosts. Removed changes to updating fleet.
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Corrected paramter name to
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