Update MetadataTypeAttribute.xml

[blackboxlogic]

Summary

Adjusting documentation to specify behavior around base class properties. As experience by myself and noted by others (https://stackoverflow.com/questions/3832946/dataannotations-metadatatype-class-ignores-base-class-properties)

[opbld32]

Docs Build status updates of commit 0eecf9e:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.ComponentModel.DataAnnotations/MetadataTypeAttribute.xml	✅Succeeded	View

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[antonfirsov]

Tagging area owners: @lajones @ajcvickers

[blackboxlogic]

I was encouraged to see MSDN documentation was open source and it seemed like Microsoft might be embracing the community and improving the quality of their product. But then my PR sat for 3 years without feedback.