Fixing typo

[leobasilio]

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

[opbld30]

Docs Build status updates of commit 70c12d6:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.ComponentModel.DataAnnotations/ValidationAttribute.xml	✅Succeeded	View

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[gewarren]

@leobasilio Thank you!