added docstring for extract_results method
added docstring for extract_results method

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