Fix link to contributing docs
Fix link to contributing docs

Refs GH-4355
zenefits/sentry,ifduyue/sentry,gencer/sentry,ifduyue/sentry,gencer/sentry,beeftornado/sentry,ifduyue/sentry,alexm92/sentry,zenefits/sentry,looker/sentry,looker/sentry,gencer/sentry,mvaled/sentry,looker/sentry,mvaled/sentry,BuildingLink/sentry,looker/sentry,jean/sentry,JackDanger/sentry,JackDanger/sentry,gencer/sentry,mvaled/sentry,zenefits/sentry,mvaled/sentry,zenefits/sentry,jean/sentry,JamesMura/sentry,BuildingLink/sentry,BuildingLink/sentry,JamesMura/sentry,mvaled/sentry,alexm92/sentry,jean/sentry,jean/sentry,gencer/sentry,jean/sentry,BuildingLink/sentry,JamesMura/sentry,JamesMura/sentry,beeftornado/sentry,JamesMura/sentry,BuildingLink/sentry,alexm92/sentry,beeftornado/sentry,looker/sentry,mvaled/sentry,zenefits/sentry,JackDanger/sentry,ifduyue/sentry,ifduyue/sentry