Clarify GASearchVariantsRequest semantics.
Clarify GASearchVariantsRequest semantics.

kellrott/schemas,heuermh/ga4gh-schemas,delagoya/schemas,laserson/schemas,Jeltje/ga4gh-schemas,benedictpaten/schemas,adamnovak/schemas,macieksmuga/schemas,nlwashington/schemas,sarahhunt/schemas,saupchurch/schemas,dglazer/schemas,ga4gh/schemas,kellrott/schemas,adamnovak/schemas,dnanexus-rnd/schemas,diekhans/ga4gh-schemas,ga4gh/ga4gh-schemas,laserson/schemas,pcingola/schemas,hjellinek/schemas,sarahhunt/schemas,lh3/schemas,benedictpaten/schemas,lh3/schemas,nlwashington/schemas,dnanexus-rnd/schemas,buske/schemas,dcolligan/schemas,hjellinek/schemas,delagoya/schemas,diekhans/ga4gh-schemas,buske/schemas,hjellinek/jeltje-schemas-sphinx,Jeltje/ga4gh-schemas