Clarify virtual hub router throughput limitations

[xsatishx]

Added note about performance degradation for TCP flows exceeding 1.5 Gbps in a single TCP flow as mentioned in https://learn.microsoft.com/en-us/azure/virtual-wan/hub-settings

Its better to state that in the main page.

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Learn Build status updates of commit 0b280ff:

💡 Validation status: suggestions

File	Status	Preview URL	Details
articles/virtual-wan/virtual-wan-about.md	💡Suggestion		Details

articles/virtual-wan/virtual-wan-about.md

• Line 115, Column 186: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/azure/virtual-wan/hub-settings' will be broken in isolated environments. Replace with a relative link.

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[Copilot]

Pull Request Overview

This PR clarifies the performance characteristics of Azure Virtual WAN hub routers by documenting a specific throughput limitation for single TCP flows. While the aggregate throughput is 50 Gbps, single TCP flows exceeding 1.5 Gbps may experience performance degradation.

Key Changes:

• Added inline documentation about single TCP flow limitations
• Included reference to detailed hub settings documentation

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[v-dirichards]

@cherylmc

Can you review the proposed changes?

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