API: restore exporting doct as doc at toplevel
API: restore exporting doct as doc at toplevel

To maintain back-compatibility.

hhslepicka/metadatastore,tacaswell/metadataStore,tacaswell/metadataStore,NSLS-II/metadatastore,ericdill/databroker,NSLS-II/metadatastore,ericdill/databroker,hhslepicka/metadatastore,arkilic/metadatastore,arkilic/metadatastore