[S06] remove fossil

We no longer map named arguments to positional parameters.

S06-routines.pod

@@ -977,20 +977,7 @@ though that's already the default for positional parameters:
 
     sub numcmp ($x!, $y!) { return $x <=> $y }
 
-The corresponding arguments are evaluated in item context and may be
-passed positionally or by name. To pass an argument by name,
-specify it as a pair: C<< I<parameter_name> => I<argument_value> >>.
-
-    $comparison = numcmp(2,7);
-    $comparison = numcmp(x=>2, y=>7);
-    $comparison = numcmp(y=>7, x=>2);
-
-Pairs may also be passed in adverbial pair notation:
-
-    $comparison = numcmp(:x(2), :y(7));
-    $comparison = numcmp(:y(7), :x(2));
-
-Passing the wrong number of required arguments to a normal subroutine
+Not passing all of the required arguments to a normal subroutine
 is a fatal error.  Passing a named argument that cannot be bound to a normal
 subroutine is also a fatal error.  (Methods are different.)