Update manifest URLs for winget docs

[rakleed]

Since winget-cli currently uses manifest version 1.5.0.

[prmerger-automator]

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

[learn-build-service-prod]

Learn Build status updates of commit 0623c89:

✅ Validation status: passed

File	Status	Preview URL	Details
hub/package-manager/package/manifest.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

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

[mattwojo]

@denelon - Could you confirm this update?

[denelon]

Yes, and we're close to 1.6. I'll try to include a note about checking these docs in the future releases.

[mattwojo]

Thanks @denelon. Yes, if there is a way to build a docs update into the release plan, that would be super helpful!
And thank you @rakleed for contributing this update!