Added documentation to su_glib.
Added documentation to su_glib.

darcs-hash:20070124134047-7659e-2a6cd59f30d8af1edbfeac5416646f53e56ea066.gz

xhook/sofia-sip,erdincay/sofia-sip,unispeech/sofia-sip,unispeech/sofia-sip,xhook/sofia-sip,xhook/sofia-sip,unispeech/sofia-sip,unispeech/sofia-sip,jart/sofia-sip,BelledonneCommunications/sofia-sip,xhook/sofia-sip,jart/sofia-sip,BelledonneCommunications/sofia-sip,erdincay/sofia-sip,BelledonneCommunications/sofia-sip,jart/sofia-sip,erdincay/sofia-sip,xhook/sofia-sip,erdincay/sofia-sip,BelledonneCommunications/sofia-sip