Update private-endpoint-overview.md

[jhalbig-hsa]

Telnet is inherently insecure, outdated and must be installed. Conversely, Test-NetConnection is available since PowerShell 5.1 and can be used immediately. This documentation change will improve the user experience by simplifying the testing method.

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Learn Build status updates of commit b8d2335:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
azure-sql/database/private-endpoint-overview.md	⚠️Warning		Details

azure-sql/database/private-endpoint-overview.md

• Line 108, Column 1: [Warning: file-not-found - See documentation] Invalid file link: '[/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc754293(v=ws.10)](https://learn.microsoft.com/en-us/powershell/module/nettcpip/test-netconnection'.
• Line 110, Column 56: [Warning: disallowed-html-tag - See documentation] HTML tag 'SQL' isn't allowed. Replace it with approved Markdown or escape the brackets if the content is a placeholder.
• Line 108, Column 1: [Suggestion: docs-link-absolute - See documentation] Absolute link '[/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc754293%28v%3dws.10%29](https://learn.microsoft.com/en-us/powershell/module/nettcpip/test-netconnection?view=windowsserver2025-ps)' will be broken in isolated environments. Replace with a relative link.

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