Updating some documentation.
Updating some documentation.

shikhar413/openmc,amandalund/openmc,smharper/openmc,walshjon/openmc,amandalund/openmc,walshjon/openmc,wbinventor/openmc,shikhar413/openmc,walshjon/openmc,liangjg/openmc,smharper/openmc,paulromano/openmc,smharper/openmc,paulromano/openmc,mit-crpg/openmc,mit-crpg/openmc,mit-crpg/openmc,smharper/openmc,paulromano/openmc,amandalund/openmc,wbinventor/openmc,liangjg/openmc,shikhar413/openmc,walshjon/openmc,liangjg/openmc,shikhar413/openmc,amandalund/openmc,wbinventor/openmc,liangjg/openmc,mit-crpg/openmc,paulromano/openmc,wbinventor/openmc