Added num_groups to the docstring for openmc.mgxs.EnergyGroups
Added num_groups to the docstring for openmc.mgxs.EnergyGroups

paulromano/openmc,shikhar413/openmc,mjlong/openmc,johnnyliu27/openmc,smharper/openmc,wbinventor/openmc,paulromano/openmc,mit-crpg/openmc,mit-crpg/openmc,walshjon/openmc,paulromano/openmc,liangjg/openmc,samuelshaner/openmc,wbinventor/openmc,johnnyliu27/openmc,mit-crpg/openmc,paulromano/openmc,walshjon/openmc,liangjg/openmc,walshjon/openmc,amandalund/openmc,samuelshaner/openmc,bhermanmit/openmc,smharper/openmc,walshjon/openmc,samuelshaner/openmc,wbinventor/openmc,amandalund/openmc,mit-crpg/openmc,johnnyliu27/openmc,smharper/openmc,kellyrowland/openmc,samuelshaner/openmc,liangjg/openmc,shikhar413/openmc,shikhar413/openmc,smharper/openmc,mjlong/openmc,bhermanmit/openmc,amandalund/openmc,shikhar413/openmc,amandalund/openmc,kellyrowland/openmc,johnnyliu27/openmc,wbinventor/openmc,liangjg/openmc