Fix URL docs contributed.
Fix URL docs contributed.

DroiTaipei/mgo,Yottaa/mgo.v2,hexadecy/mgo,deafgoat/mgo,deafgoat/mgo,gabrielrussell/mgo,Yottaa/mgo.v2,hexadecy/mgo,gabrielrussell/mgo,DroiTaipei/mgo,hexadecy/mgo,DroiTaipei/mgo,go-mgo/travis-test,deafgoat/mgo,go-mgo/travis-test,gabrielrussell/mgo,DroiTaipei/mgo,deafgoat/mgo,go-mgo/travis-test,go-mgo/travis-test,hexadecy/mgo,Yottaa/mgo.v2,gabrielrussell/mgo,Yottaa/mgo.v2