Two small changes to style guide.
Two small changes to style guide.

The first change clarifies the use of intent on arguments to
procedures. Specifically, pointer dummy arguments cannot have intent
specified. Secondly, a rule was added to enforce spacing between procedure
arguments.

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