Incorrect CustomValidationAttribute remarks

[hrobertson]

Content: https://docs.microsoft.com/en-us/dotnet/api/system.componentmodel.dataannotations.customvalidationattribute.method?view=netcore-2.2 Content source: xml/System.ComponentModel.DataAnnotations/CustomValidationAttribute.xml

The remarks for the Method property of CustomValidationAttribute incorrectly state that the specified method must return a Boolean and takes a ValidationResult out param. In .Net Core 2.2 at least, it must return a ValidationResult.

Maybe the signature is different in different languages?

Additionally, it would be preferable to have the valid signatures listed as code snippets rather than described in text.