Fixed doc typo
Fixed doc typo

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