react-native-windows-samples Fix "fix-unbroken" script

@jonthysell might know. I don't think the new exclusions fix-unbroken is adding are right, as there are missing ones. You can delete those and just add !versioned_docs/version-0.64/*-api-windows*.md for the time being but we should fix fix-unbroken : )

Originally posted by @asklar in https://github.com/microsoft/react-native-windows-samples/issues/409#issuecomment-799825843

Mar 15 '21 23:03 NickGerleman

fix-unbroken doesn't understand when files have different names than their ids, which is the case with all of the api docs.

Mar 16 '21 00:03 jonthysell

There were a couple of other exclusions I needed to manually.

Mar 16 '21 01:03 NickGerleman

Right, those files are referring to api docs files by ID.

Mar 16 '21 21:03 jonthysell