Update max outbound connections reference in limits doc

[atsushina]

I understand that the number of outbound connections for the Azure Functions is subject to the SNAT limitations of App Service when using the Dedicated or Premium plan.

While the App Service documentation states this restriction explicitly, the limits on Azure Functions for Premium and Dedicated plans are described as unbounded, leading to a discrepancy in the information.

Therefore, I believe it would be better to revise and clarify this inconsistency.

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[ktoliver]

@ggailey777

Can you review the proposed changes?

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