Update a REX

JWT is required for this endpoint with at least one of the following scopes: o{params.orgId}-hw:w,o{params.orgId}-site:w,o{params.orgId}-siteGeneral:w,o{params.orgId}-admin:w,o{params.orgId}-quickStart:w,o:w,s-o:w<br/><br/>Endpoint name: updateRex