Being pedantic: common typo in specs

I've been seeing "superceded" on a number of W3C pages. The correct spelling
is "superseded".

Please see http://www.google.com/search?q=superceded+site%3Awww.w3.org%2FTR
which currently returns 59 results.

In particular, the 2 occurrences on http://www.w3.org/TR/xptr/ are especially
grating :) ... any chance you could clean this up?

Thanks