Fix up docstrings for Lattice and its subclasses
Fix up docstrings for Lattice and its subclasses

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