Document limitations for shared Application Gateway usage

[jamesonhearn]

There is no defined limitation on multiple AGIC usage, but there is also no guidance on how to achieve it.

Added limitations for sharing an Application Gateway across multiple AGIC instances, including YAML configuration example and notes on hostname/path management.

[learn-build-service-prod]

Learn Build status updates of commit 8ba9de3:

💡 Validation status: suggestions

File	Status	Preview URL	Details
articles/application-gateway/ingress-controller-install-existing.md	💡Suggestion		Details

articles/application-gateway/ingress-controller-install-existing.md

• Line 311, Column 97: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/azure/application-gateway/ingress-controller-install-existing#enable-a-shared-application-gateway-deployment-by-using-a-new-agic-installation' will be broken in isolated environments. Replace with a relative link.

For more details, please refer to the build report.

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[prmerger-automator]

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[ktoliver]

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