[WWcvs] pg: Fixed a typo in an error message.

[dpvc v. a. <we...@ma...>]

Log Message:
-----------
Fixed a typo in an error message.

Modified Files:
--------------
    pg/macros:
        contextOrdering.pl

Revision Data
-------------
Index: contextOrdering.pl
===================================================================
RCS file: /webwork/cvs/system/pg/macros/contextOrdering.pl,v
retrieving revision 1.6
retrieving revision 1.7
diff -Lmacros/contextOrdering.pl -Lmacros/contextOrdering.pl -u -r1.6 -r1.7
--- macros/contextOrdering.pl
+++ macros/contextOrdering.pl
@@ -190,7 +190,7 @@
 
 sub _check {
   my $self = shift;
-  $self->Error("Operators of %s must be letters",$self->{bop})
+  $self->Error("Operands of %s must be letters",$self->{bop})
     unless $self->isOrdering($self->{lop}) && $self->isOrdering($self->{rop});
   $self->{letters} = $self->{lop}{letters}; # we modify {lop}{letters} this way, but that doesn't matter
   foreach my $x (keys %{$self->{rop}{letters}}) {