Add documentation for invalid_node_id_t
Add documentation for invalid_node_id_t

DavadDi/actor-framework,1blankz7/actor-framework,1blankz7/actor-framework,cmaughan/actor-framework,nq-ebaratte/actor-framework,rvlm/actor-framework,DavadDi/actor-framework,firegurafiku/actor-framework,actor-framework/actor-framework,firegurafiku/actor-framework,cmaughan/actor-framework,actor-framework/actor-framework,DavadDi/actor-framework,1blankz7/actor-framework,actor-framework/actor-framework,rvlm/actor-framework,1blankz7/actor-framework,nq-ebaratte/actor-framework,firegurafiku/actor-framework,nq-ebaratte/actor-framework,DavadDi/actor-framework,cmaughan/actor-framework,nq-ebaratte/actor-framework,rvlm/actor-framework,actor-framework/actor-framework