There's a broken link to Protecting the pre-OS environment with UEFI on this page.
⚠Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.
Thank you for reporting the broken link. I do my best to keep an eye out for reports like this one, because correcting the links is a fairly straightforward task.
Unfortunately, the document is no longer located within the microsoft.com domain and can therefore no longer be updated in that link. Unless the original author decides to upload the document to microsoft.com and verify that it is restored and authentic, we can only suggest external references to the original document from 2011:
As you can see above, I was only able to find verbatim copies of the document in the WayBack Machine (web.archive.org) and on the site ghacks.net .
See also Pull Request #8604 for removal of the outdated link and its text description.
Closing via #8604
Thanks