Fix issue in attribute line with attribute class name

[praveenkuttappan]

Fixes following issue in attribute line

Attribute line is shown as [AttributeUsage(AttributeTargets . Class ) ] instead of [AttributeUsage(AttributeTargets.Class )]

[maririos]

@christothes are there any other cases where there needs to be special considerations for attributes?

[praveenkuttappan]

Review block for attribute with class looks like below with this fix.

[AttributeUsage(AttributeTargets.Class)] 
public sealed class PersistableModelProxyAttribute : Attribute { 
  public PersistableModelProxyAttribute(Type proxyType); 
  [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)] 
  public Type ProxyType { get; }
}