Applied to a type or field?

The Remarks section states that this attribute can be "applied to types, properties, fields, methods, and method parameters", then explains some cases, but not the types nor the field ones.
It would be beneficial to explain both these cases too, as they are not obvious.

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#### Document Details

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* ID: 11dfc639-e939-8944-28d6-9c82b53b0676
* Version Independent ID: cf71b269-876f-c64d-72fb-23fc83a9b8c9
* Content: [CustomValidationAttribute Class (System.ComponentModel.DataAnnotations)](https://docs.microsoft.com/en-us/dotnet/api/system.componentmodel.dataannotations.customvalidationattribute?view=netframework-4.7.2#remarks)
* Content Source: [xml/System.ComponentModel.DataAnnotations/CustomValidationAttribute.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.ComponentModel.DataAnnotations/CustomValidationAttribute.xml)
* Product: **.net**
* GitHub Login: @dotnet-bot
* Microsoft Alias: **riande**

Abre xml/System.ComponentModel.DataAnnotations/CustomValidationAttribute.xml y lee el contenido de Remarks para CustomValidationAttribute. Amplía la explicación para cubrir cómo se aplica el atributo a tipos y campos, siguiendo la discusión existente sobre otros destinos. La tarea estará terminada cuando la documentación de Remarks generada explique claramente ambos casos.

Escrito por el modelo de indexación a partir del texto del issue.