Fix copy paste: IsUint32() checks if value is unsigned, not signed.

Review URL: http://codereview.chromium.org/1762008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4513 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

include/v8.h

@@ -767,7 +767,7 @@ class V8EXPORT Value : public Data {
   bool IsInt32() const;
 
   /**
-   * Returns true if this value is a 32-bit signed integer.
+   * Returns true if this value is a 32-bit unsigned integer.
    */
   bool IsUint32() const;