Fix name of Supply method which returns a Channel

Author: baby-gnu

doc/Language/concurrency.pod6

@@ -487,7 +487,7 @@ C<react> block described earlier:
     await $p;
 
 It is also possible to obtain a L<Channel> from a L<Supply> using the
-L<Supply method|/type/Supply#method_Channel> which returns a L<Channel>
+L<Channel method|/type/Supply#method_Channel> which returns a L<Channel>
 which is fed by a C<tap> on the L<Supply>:
 
     my $supplier = Supplier.new;