[whatwg] Another typo in "Annotations for assistive technology products (ARIA)" section

[Ian Hickson]

On Fri, 23 Oct 2009, Mark Pilgrim wrote:
>
> "Either a button element or an input element is required to when using 
> the button role"
> 
> should read
> 
> "Either a button element or an input element is required when using the 
> button role"

Fixed.

-- 
Ian Hickson               U+1047E                )\._.,--....,'``.    fL
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