OR-496 Update the doc REST_user.md
OR-496 Update the doc REST_user.md

Update the endpoint `GET /api/user/activitystreams` by adding a request
query string parameter for the domainid.

chamerling/rse-chamerling,heroandtn3/openpaas-esn,heroandtn3/openpaas-esn,heroandtn3/openpaas-esn,chamerling/rse-chamerling