Fix documentation of mu, energy, energyout filters
Fix documentation of mu, energy, energyout filters

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