fix bad copypasta, also the callback doesn't have to be a method

Author: gfldex

doc/Type/Supply.pod6

@@ -60,11 +60,11 @@ called when a new value becomes available through the C<emit> call.
 
 The C<&done> callback is called when the C<done> method on the supply is
 called, indicating the end of life of the channel. For a C<live> supply the
-C<done> method will be called on the parent C<Supplier>.
+C<done> routine will be called on the parent C<Supplier>.
 
 The C<&quit> callback is called when the C<quit> method on the supply is
 called, indicating an erroneous termination of the supply. For a C<live>
-supply the C<done> method will be called on the parent C<Supplier>
+supply the C<quit> routine will be called on the parent C<Supplier>
 
 Method C<tap> returns an object of type L<Tap|/type/Tap>, on which you can
 call the C<close> method to cancel the subscription.