Some public `Attribute`s lack doc comments

[dougbu]

A fairly complete list below. Hit [NonAction] then found the rest.

Might have missed one or two. Was also only looking for doc comments on the classes; didn't check that every constructor and property was documented.

• [NonAction]
• [BindingBehavior]
• [BindNever]
• [BindRequired]
• [ActionName]
• [Area]
• [ViewComponent]
• [UseWebApiActionConventions]
• [UseWebApiOverloading]
• [UseWebApiParameterConventions]
• [UseWebApiRoutes]

[Eilon]

See if we can copy some of the text from MSDN for the ones that already existed. No need to get too fancy.

[dougbu]

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