Updated createEmailBatches JSDoc
Updated createEmailBatches JSDoc

refs https://github.com/TryGhost/Team/issues/828

- Updated to follow latest code standards

ErisDS/Ghost,e10/Ghost,TryGhost/Ghost,janvt/Ghost,ErisDS/Ghost,janvt/Ghost,ErisDS/Ghost,TryGhost/Ghost,TryGhost/Ghost,e10/Ghost