add per repo consideration to docs

[Muhammadsaeed707]

add per repo consideration to docs. new change from this pr: https://github.com/huggingface-internal/moon-landing/pull/18964

(also to share with this customer https://huggingface.slack.com/archives/C08NNTKSHH9/p1783446066600199)

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Note

Low Risk
Documentation-only change with no runtime or security behavior impact.

Overview
Updates docs/hub/enterprise-service-accounts.md in the Managing Access Tokens section to describe how fine-grained permissions can be scoped.

Organization-wide permissions apply across all org repos; per-repository permissions limit read/write to selected repos (org-owned or public), with a short example of a single-model read-only token.

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[Copilot]

Pull request overview

Updates the Service Accounts documentation to clarify how fine-grained access token permissions can be scoped, adding guidance on organization-wide versus per-repository token scoping for enterprise service accounts.

Changes:

• Adds an explanation of two permission-scoping levels: organization-wide and per-repository.
• Adds an example emphasizing narrowly scoped tokens (e.g., read access to a single model repo).

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[HuggingFaceDocBuilderDev]

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