small patch for contribute.xml

[Milo Casagrande]

Ciao all!
I was translating the contribute.xml.
Using it with yelp to check out the trnaslations, I found a couple of
errors:
- there's no entity for &irc-server; i nthe document
- there's a &irc-network; entity instead of &irc-server;

The patch I'm attacching should correct these two issues.

Cheers.

-- 
Milo Casagrande <milo_casagrande at yahoo.it>
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