fix incorrect TCP connection test command for Windows

[jagilber]

Updated PowerShell command for testing TCP connection to use Test-NetConnection with additional parameters. Current documentation example has a cmdlet that doesnt exist: 'Test-TcpConnection'

[prmerger-automator]

@jagilber : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit c65d3b6:

❌ Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
	❌Error		Details

• Line 0, Column 0: [Error: committish-not-found] Can't find branch, tag, or commit 'main' for repo https://github.com/Azure-Samples/azure-digital-twins-getting-started.

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[Court72]

@Padmalathas

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team