Added ToC entries and minor tweaks to @walbourn's new Windows articles

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Learn Build status updates of commit 3816308:

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PRMerger Results

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Yaml File(s)	This PR includes changes to .yml file(s) owned by another author.

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Learn Build status updates of commit 0daa95a:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
vcpkg/TOC.yml	:white_check_mark:Succeeded	View
vcpkg/users/platforms/uwp.md	:white_check_mark:Succeeded	View
vcpkg/users/platforms/windows.md	:white_check_mark:Succeeded	View

For more details, please refer to the build report.

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PRMerger Results

Issue	Description
Yaml File(s)	This PR includes changes to .yml file(s) owned by another author.