Fix typo

lib/variables.pod

@@ -129,7 +129,7 @@ Note how the attributes are declared as C<$.x> and C<$.y> but are still
 accessed via C<$!x> and C<$!y>. This is because in Perl 6 all attributes are
 private and can be directly accessed within the class by using
 C<$!attribute-name>. Perl 6 may automatically generate accessor methods for you
-tough. For more details on objects, classes and their attributes see L<objects>.
+though. For more details on objects, classes and their attributes see L<objects>.
 
 =head2 C<?>