bundle.md: fix link formatting
bundle.md: fix link formatting

wangkirin/specs,jhjeong-kr/specs,kensipe/specs,talwai/specs,HardikDR/specs,zenlinTechnofreak/specs,runcom/specs,sladage/specs,ujuc/specs,wking/opencontainer-specs,navidshaikh/specs,marcosnils/specs,opencontainers/specs,philips/specs,LK4D4/specs,wking/opencontainer-runtime-spec,jonboulle/specs,dustymabe/specs,hqhq/specs,opencontainers/runtime-spec,hqhq/runtime-spec,cloudfoundry-incubator/specs,ChengTiesheng/specs,gao-feng/specs,mheon/specs,laijs/specs,vbatts/specs,vishh/specs,rootfs/specs,haijunTan/specs