[Docs][Enhancement Request] Description of set-able properties should provide more information then the Name itself

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I was looking through the provided metadata properties and looked up the docs, so hopefully get more information to this as it seemed to do nothing at all, so before opening a issue to faulted behaviour, this should be the place to see what should be to expect.

https://dotnet.github.io/docfx/reference/docfx-json-reference.html#globalnamespaceid

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Not using, because it seems to have no effect?

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