PATCH: update man page for --style xml

[Dan Connolly]

I noticed this nifty feature in
http://mercurial.selenic.com/wiki/WhatsNew

but it doesn't seem to be documented... so... here you go.

-- 
Dan Connolly, W3C http://www.w3.org/People/Connolly/
gpg D3C2 887B 0F92 6005 C541  0875 0F91 96DE 6E52 C29E
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