Merge pull request #1010 from samcv/signal

Show how to go from signal numbers to Signal objects to use with the signal method

doc/Type/Supply.pod6

@@ -599,8 +599,15 @@ the supply.  For example:
 
     signal(SIGINT).tap( { say "Thank you for your attention"; exit 0 } );
 
-would catch Control-C, thank you, and then exit.  The list of supported
-signals can be found by checking Signal::.keys (as you would any enum).
+would catch Control-C, thank you, and then exit.
+
+To go from a signal number to a Signal, you can do something like this:
+
+    signal(Signal(2)).tap( -> $sig { say "Received signal: $sig" } );
+
+The list of supported signals can be found by checking Signal::.keys (as
+you would any enum). For more details on how enums work see
+L<enum|/language/typesystem#enum>.
 
 =head2 method IO::Notification.watch-path