fixed line lengths in resource_exchange.rst
fixed line lengths in resource_exchange.rst

mbmcgarry/cyclus,hodger/cyclus,mbmcgarry/cyclus,Baaaaam/cyclus,Baaaaam/cyclus,hodger/cyclus,hodger/cyclus,gidden/cyclus,gidden/cyclus,rwcarlsen/cyclus,rwcarlsen/cyclus,Baaaaam/cyclus,mbmcgarry/cyclus,rwcarlsen/cyclus,mbmcgarry/cyclus,hodger/cyclus,hodger/cyclus,rwcarlsen/cyclus,gidden/cyclus,gidden/cyclus