2nd round review feedback from rmustacc.

*** 25,35 ****
  Within these various declarations, we have the following field types:
  
  <envs>    This is a list of compilation environments where the symbol
            should be legal.  To indicate that the symbol must not be legal
            an environment group can be prefixed with "-".  For example,
!           "SUS -SUSv4+" indicates a symbol that is legal in all SUS
            environments up to SUSv3, and was removed in SUSv4 and subsequent
            versions of SUS.  As you can see, we can list multiple environments
            or environment groups, and we can add or remove to previous groups
            with subsequent ones.
  
--- 25,35 ----
  Within these various declarations, we have the following field types:
  
  <envs>    This is a list of compilation environments where the symbol
            should be legal.  To indicate that the symbol must not be legal
            an environment group can be prefixed with "-".  For example,
!           "SUS+ -SUSv4+" indicates a symbol that is legal in all SUS
            environments up to SUSv3, and was removed in SUSv4 and subsequent
            versions of SUS.  As you can see, we can list multiple environments
            or environment groups, and we can add or remove to previous groups
            with subsequent ones.