clarify indel test
clarify indel test

macarthur-lab/gnomad_browser,macarthur-lab/gnomad_browser,konradjk/exac_browser,macarthur-lab/gnomad_browser,konradjk/exac_browser,macarthur-lab/gnomad_browser,konradjk/exac_browser,macarthur-lab/gnomad_browser