docs: actor_id for OrganizationAdmin changed to 0

[stempler]

Previously the actor_id used by the OrganizationAdmin actor_type was 1, this was changed to 0.
A configuration using 1 does not result in an error, but any subsequent terraform plan detects the internal change to 0 and wants to update the actor_id.

Resolves #2536

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Before the change?

• Documentation states that the actor_id to use for actor type OrganizationAdmin is 1

After the change?

• Documentation states that the actor_id to use for actor type OrganizationAdmin is 0

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[github-actions]

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