Adds docs about removing any UserCredential relationship manually from generated User SDL

[cannikin]

In response to this Issue: #5841, specifically the comments that start here: #5841 (comment)

These users were generating a User SDL after making the UserCredential schema changes. The SDL/scaffold generator would add a UserCredential type to the User SDL, assuming that you wanted to access those child records. Since there was no requisite UserCredential SDL file, that type was undefined, which makes the api server blow up:

We plan on adding this field name to our upcoming allow/blocklist of generated fields (along with stuff like hashedPassword and salt) so that it doesn't not get generated by default and confuse folks who suddenly start getting errors.

[cannikin]

@jtoar I would have listed this as "docs only" but it does include an update to the post-install message in one of the setup commands. But if there's an option to re-deploy the docs site, we could do that: I backported the new doc message to the 3.0 and 3.1 versioned docs dirs.

[replay-io]

10 replays were recorded for ff69ebc.

0 Failed

10 Passed

• requireAuth graphql checks
• useAuth hook, auth redirects checks
• RBAC: Admin user should be able to delete contacts
• RBAC: Should not be able to delete contact as non-admin user
• Smoke test with dev server
• Smoke test with rw serve
• Loads Cell mocks when Cell is nested in another story
• Loads Cell Stories
• Loads MDX Stories
• Mocks current user, and updates UI while dev server is running

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