Fix links to native winapi docs in SafeHandle

[rzikm]

Fixes #10258.

[AaronRobinsonMSFT]

Content looks good to me. @gewarren can help validate the markdown conversion.

Markdown format isn't working - see https://review.learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.safehandle?view=net-9.0&branch=pr-en-us-10283#notes-to-implementers.

[gewarren]

You could remove the Markdown formatting and format the links like this instead:

use the <see href="/windows/win32/api/handleapi/nf-handleapi-closehandle">CloseHandle</see> function

[learn-build-service-prod]

Learn Build status updates of commit 7f29f64:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Runtime.InteropServices/SafeHandle.xml	✅Succeeded	View

For more details, please refer to the build report.

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[gewarren]

Thank you!