Add additional information on user needing to create a Docker account first before accepting invitation

[ytazky]

Is this a docs issue?

• [X] My issue is about the documentation content or website

Type of issue

I can't find what I'm looking for

Description

It is true that users are not required to be logged in before an invitation is sent, however, the user need to be created first in Docker Hub then only they can accept the invitation.

Location

https://docs.docker.com/faq/admin/organization-faqs/#do-users-first-need-to-authenticate-with-docker-before-an-owner-can-add-them-to-an-organization

Suggestion

No response