feat(docs): document the new activity events
feat(docs): document the new activity events

mozilla/fxa-auth-server,eoger/fxa-auth-server,eoger/fxa-auth-server,mozilla/fxa-auth-server,shane-tomlinson/fxa-auth-server,mozilla/fxa-auth-server,shane-tomlinson/fxa-auth-server,eoger/fxa-auth-server,shane-tomlinson/fxa-auth-server,mozilla/fxa-auth-server,eoger/fxa-auth-server,shane-tomlinson/fxa-auth-server