Security section missing info about tenant tokens

[jameswagoner]

Was lost for a while about an invalid_api_key error when trying to fetch documents with a tenant token.

Luckily top search result is an issue from June '22 and a PR that added a note to the docs about tenant tokens only supporting the search endpoints.

#2832 omitted the note.

That should get added back in. I am not a copywriter or totally would offer a PR.

[guimachiavelli]

Thanks for opening this issue, @jameswagoner! Although the restriction of tenant tokens to the search endpoint is still present in Multitenancy and tenant tokens, your feedback is good indication we should make that information more visible there, and available in other places.

Thanks again! It's super helpful for us to get direct feedback for this sort of thing!