nua_tag.c: updated NUTAG_RETRY_COUNT() documentation
nua_tag.c: updated NUTAG_RETRY_COUNT() documentation

darcs-hash:20080513204957-db55f-d59ca0d6f819efb90d18d31e875572f571f67df8.gz

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