Update conf.py
Update conf.py

I think this might be a bit more clear, also why is there a trailing `_` on the env variable?
arkilic/metadatastore,NSLS-II/metadatastore,hhslepicka/metadatastore,hhslepicka/metadatastore,ericdill/databroker,tacaswell/metadataStore,NSLS-II/metadatastore,ericdill/databroker,arkilic/metadatastore,tacaswell/metadataStore