correct vcfallelicprimitives docs
correct vcfallelicprimitives docs

vcflib/vcflib,ekg/vcflib,ekg/vcflib,ekg/vcflib,vcflib/vcflib,ekg/vcflib,vcflib/vcflib,vcflib/vcflib,vcflib/vcflib,vcflib/vcflib,vcflib/vcflib,ekg/vcflib,vcflib/vcflib