Use cross repo includes

[alexwolfmsft]

Summary

Describe your changes here.

Fixes #Issue_Number (if available)

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Internal previews

📄 File	🔗 Preview link
docs/azure/sdk/authentication/local-development-broker.md	Authenticate .NET apps to Azure services during local development using brokered authentication
docs/azure/sdk/authentication/local-development-dev-accounts.md	Authenticate .NET apps to Azure using developer accounts
docs/azure/sdk/authentication/local-development-service-principal.md	Authenticate .NET apps to Azure services during local development using service principals
docs/azure/sdk/authentication/on-premises-apps.md	docs/azure/sdk/authentication/on-premises-apps
docs/azure/sdk/authentication/system-assigned-managed-identity.md	Authenticate Azure-hosted .NET apps to Azure resources using a system-assigned managed identity
docs/azure/sdk/authentication/user-assigned-managed-identity.md	Authenticate Azure-hosted .NET apps to Azure resources using a user-assigned managed identity