Add how-to docs for Private Links, Private Endpoints, and NSP Configuration operations

[Copilot]

New how-to documentation for the standard ARM operation templates covering private networking scenarios. These templates exist in typespec-azure-resource-manager with samples but had no user-facing guides.

Three new pages under website/src/content/docs/docs/howtos/ARM/:

• private-links.md — PrivateLink model + PrivateLinks<> interface (Read, ListByParent)
• private-endpoints.md — PrivateEndpointConnectionResource model + PrivateEndpoints<> interface (full CRUD: Read, CreateOrUpdateAsync, CustomPatchAsync, DeleteAsync, ListByParent, plus sync variants)
• network-security-perimeter.md — NspConfiguration model + NspConfigurations<> interface (Read, ListByParent, Action, ActionAsync), with a note on the v5 common-types minimum

Each doc covers: resource model definition → operations alias setup → wiring into @armResourceOperations interface → available operations table → complete example → child resource reuse pattern.

// Pattern shown in each doc
model PrivateEndpointConnection is PrivateEndpointConnectionResource;
alias PrivateEndpointOps = PrivateEndpoints<PrivateEndpointConnection>;

@armResourceOperations
interface Employees {
  getConnection is PrivateEndpointOps.Read<Employee>;
  createConnection is PrivateEndpointOps.CreateOrUpdateAsync<Employee>;
  deleteConnection is PrivateEndpointOps.DeleteAsync<Employee>;
  listConnections is PrivateEndpointOps.ListByParent<Employee>;
}

Pages auto-appear in the sidebar via the existing autogenerate config for the howtos directory.

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[azure-sdk]

No changes needing a change description found.

[markcowl]

/azp run typespec-azure - CI

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Azure Pipelines successfully started running 1 pipeline(s).

[azure-sdk]

You can try these changes here

🛝 Playground	🌐 Website