Updated several links that have changed recently

[riddick2026]

We recently updated our main portal and moved video training. We are updating URL Pointers to new location

[opbld30]

Learn Build status updates of commit ede3a52:

💡 Validation status: suggestions

File	Status	Preview URL	Details
Docs/Overview/additional-information.md	💡Suggestion		Details

Docs/Overview/additional-information.md

• Line 16, Column 3: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/windows/uwp/audio-video-camera/playready-Client-sdk' will be broken in isolated environments. Replace with a relative link.
• Line 18, Column 3: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/previous-versions/windows/apps/dn468834(v=ieb.10)' will be broken in isolated environments. Replace with a relative link.

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link 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.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[kevrio]

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