Fixing typo (#4943)

The exception is thrown if `IsValid` returns false, not `Validate`.

Author: leobasilio

xml/System.ComponentModel.DataAnnotations/ValidationAttribute.xml

@@ -611,7 +611,7 @@ This constructor chooses a very generic validation error message. Developers sub
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 ## Remarks  
- This method calls the <xref:System.ComponentModel.DataAnnotations.ValidationAttribute.IsValid%2A> method to determine whether the object that is specified by the `value` parameter is valid. If the <xref:System.ComponentModel.DataAnnotations.ValidationAttribute.Validate%2A> method returns `false`, this method calls the <xref:System.ComponentModel.DataAnnotations.ValidationAttribute.FormatErrorMessage%2A> method to get a localized message that states the problem. It then throws a <xref:System.ComponentModel.DataAnnotations.ValidationException> exception.  
+ This method calls the <xref:System.ComponentModel.DataAnnotations.ValidationAttribute.IsValid%2A> method to determine whether the object that is specified by the `value` parameter is valid. If the <xref:System.ComponentModel.DataAnnotations.ValidationAttribute.IsValid%2A> method returns `false`, this method calls the <xref:System.ComponentModel.DataAnnotations.ValidationAttribute.FormatErrorMessage%2A> method to get a localized message that states the problem. It then throws a <xref:System.ComponentModel.DataAnnotations.ValidationException> exception.  
   
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