Fix centos6 doc dir in rpm spec
Fix centos6 doc dir in rpm spec

biddyweb/flexisip,gale320/flexisip,biddyweb/flexisip,BelledonneCommunications/flexisip,BelledonneCommunications/flexisip,biddyweb/flexisip,BelledonneCommunications/flexisip,gale320/flexisip,gale320/flexisip,gale320/flexisip,biddyweb/flexisip,BelledonneCommunications/flexisip