Grains: Fixed canonical data to have standard error indicator (#1322)
Grains: Fixed canonical data to have standard error indicator (#1322)

* Grains: Fixed canonical data to have standard error indicator

* issue 1309: Updated comments to reflect canonical error messages

rpottsoh/x-common,exercism/x-common,petertseng/x-common,petertseng/x-common,jmluy/x-common,jmluy/x-common,ErikSchierboom/x-common,jmluy/x-common,ErikSchierboom/x-common,exercism/x-common,rpottsoh/x-common