removed $ from docs
removed $ from docs

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