[racket] set-symmetric-difference docs typo?

I pushed a fix.

Thanks for the report!

Vincent



At Thu, 23 Oct 2014 21:27:01 -0400,
Stephen Chang wrote:
> 
> The docs for set-symmetric-difference (and the mutable version) says:
> 
> "Produces a set of the same type as st0 that includes all of the
> elements contained an even number of times in st0 and the sts."
> 
> But it should be odd?
> 
> (and the example seems to confirm this)
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