Fix broken video link for installing NuGet package

[meaghanlewis]

This pull request updates the NuGet quickstart documentation to reference a more relevant instructional video for installing and using a NuGet package with the .NET CLI.

Documentation update:

• In docs/quickstart/install-and-use-a-package-using-the-dotnet-cli.md, replaced the old NuGet 101 video embed with a link to a newer, beginner-focused video on installing a NuGet package using the .NET CLI.

[Copilot]

Pull Request Overview

This PR fixes a broken video reference in the NuGet quickstart documentation by replacing an outdated embedded video with a link to a more current instructional video about installing NuGet packages using the .NET CLI.

• Replaces an embedded video with a text link to a newer, more relevant video
• Updates the video reference to focus specifically on .NET CLI usage for beginners

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[learn-build-service-prod]

Learn Build status updates of commit 05d3b40:

💡 Validation status: suggestions

File	Status	Preview URL	Details
docs/quickstart/install-and-use-a-package-using-the-dotnet-cli.md	💡Suggestion	View	Details

docs/quickstart/install-and-use-a-package-using-the-dotnet-cli.md

• Line 106, Column 1: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/shows/dotnet-package-management-with-nuget-for-beginners/installing-a-nuget-package-using-the-dotnet-cli-nuget-for-beginners' will be broken in isolated environments. Replace with a relative link.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

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More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[learn-build-service-prod]

Learn Build status updates of commit 5b4b6ae:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/quickstart/install-and-use-a-package-using-the-dotnet-cli.md	✅Succeeded	View

For more details, please refer to the build report.