Update index chat settings method listed as `PATCH` instead of `PUT`

[nicolasvienot]

Location: https://www.meilisearch.com/docs/reference/api/settings#update-index-chat-settings

In the API reference, to update the index chat settings, it says:

PATCH
/indexes/{index_uid}/settings/chat

It should be a PUT

This could be the case for other settings.

[nicolasvienot]

cc @Kerollmops @tpayet

[nicolasvienot]

Also, for this section:
https://www.meilisearch.com/docs/reference/api/settings#body-22

Sort is an array of String
attributesToSearchOn is an array of String

[guimachiavelli]

Thanks for the report, will be deployed together with a bunch of other /chats fixes on v1.16 release