HMS-2590 fix: use 'resources' tag for PATCH /domains/:domain_id

This change update the tags for the PATCH /domains/:domain_id operation; the
endpoint is intended to be used by a user, not a system; the name of the tags
would need a rename, but it is not the target of this change; the target is to
group this endpoint in the same group of tags where are the other user
operations, so that when the client code is re-generated for the frontend side,
the operation is available in the same factory class as the other endpoints
intended for a user.

For the backend, the only impact is the `spec.gen.go` file which is updated
because the openapi has this slight change; but it does not have any additional
impact into the backend as the boilerplate generated is not filtering by some
set of tags, nor it is generating different set of objects depending on the
tags the endpoint belongs to.

Signed-off-by: Alejandro Visiedo <[email protected]>