updated doc for migrations
updated doc for migrations

FokkeZB/alloy,jvkops/alloy,xavierlacot/alloy,jppope/alloy,4talesa/alloy,brentonhouse/brentonhouse.alloy,xavierlacot/alloy,NadsonFernando/alloy,brentonhouse/brentonhouse.alloy,indera/alloy,NadsonFernando/alloy,WY08271/alloy,WY08271/alloy,bhatfield/alloy,mobilehero/adamantium,bhatfield/alloy,NadsonFernando/alloy,jvkops/alloy,jppope/alloy,indera/alloy,4talesa/alloy,jppope/alloy,FokkeZB/alloy,indera/alloy,xavierlacot/alloy,jvkops/alloy,brentonhouse/brentonhouse.alloy,4talesa/alloy,WY08271/alloy,FokkeZB/alloy,mobilehero/adamantium,bhatfield/alloy,mobilehero/adamantium