[whatwg] Minor addition/rewording for canvas section

[Oliver Hunt]

Hi all,

Section 3.14.11 contains the statement:
"Security: To prevent information leakage, the toDataURL() and  
getImageData() methods should raise a security exception if the canvas  
has ever had an image painted on it whose origin is different from  
that of the script calling the method."

In the interests of completeness this should probably read
"Security: To prevent information leakage, the toDataURL() and  
getImageData() methods should raise a security exception if the canvas  
has ever had an image or ImageData painted on it whose origin is  
different from that of the script calling the method."
(or similar)

--Oliver
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