Added paragraph on new scattering subelement for nuclides
Added paragraph on new scattering subelement for nuclides

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