Enhancement: add database user update

[dweinshenker]

What

Add ability to update a user's settings via a PUT request. This will enable other clients to avoid having to recreate user resources when attempting to update settings

[andrewsomething]

👍 Changes look good. I am noticing that we don't seem to document PUT /v2/databases/$DATABASE_ID/users. Would be great to get that covered.

https://docs.digitalocean.com/reference/api/api-reference/#operation/databases_add_user

[dweinshenker]

👍 Changes look good. I am noticing that we don't seem to document PUT /v2/databases/$DATABASE_ID/users. Would be great to get that covered.

https://docs.digitalocean.com/reference/api/api-reference/#operation/databases_add_user

will be adding a follow-on PR to support this

[dweinshenker]

👍 Changes look good. I am noticing that we don't seem to document PUT /v2/databases/$DATABASE_ID/users. Would be great to get that covered.
https://docs.digitalocean.com/reference/api/api-reference/#operation/databases_add_user

will be adding a follow-on PR to support this

@andrewsomething here is the follow-on PR for the openapi docs

digitalocean/openapi#847