fixed a doc typo
fixed a doc typo

jewmanchue/vcflib,hyphaltip/vcflib,jewmanchue/vcflib,tomdcsmith/vcflib,jewmanchue/vcflib,hyphaltip/vcflib,travc/vcflib,ekg/vcflib,vcflib/vcflib,jewmanchue/vcflib,zeeev/vcflib,zeeev/vcflib,jewmanchue/vcflib,vcflib/vcflib,ekg/vcflib,vcflib/vcflib,vcflib/vcflib,ekg/vcflib,tomdcsmith/vcflib,ekg/vcflib,travc/vcflib,zeeev/vcflib,hyphaltip/vcflib,jewmanchue/vcflib,hyphaltip/vcflib,travc/vcflib,zeeev/vcflib,vcflib/vcflib,hyphaltip/vcflib,tomdcsmith/vcflib,ekg/vcflib,hyphaltip/vcflib,vcflib/vcflib,zeeev/vcflib,zeeev/vcflib,vcflib/vcflib,vcflib/vcflib