Update cross-cluster networking article with notes

[Khushbu-Parekh]

Added note about cross-cluster networking availability and limitations.

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[Khushbu-Parekh]

#Sign-off

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Pull request overview

This PR updates the Azure Kubernetes Fleet Manager cross-cluster networking how-to by adding a callout note that clarifies current regional availability and sets expectations about broader availability.

Changes:

• Added a NOTE callout listing the Azure regions where cross-cluster networking is currently available.
• Added a statement about expected timeline for global availability.

[Court72]

@sjwaight

Can you review the proposed changes?

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[v-dirichards]

@sjwaight

Can you review this old PR and determine whether it needs to be closed or merged?

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