Use numbers instead of incoherent text

This way the example is easier to follow.

doc/Type/Proc/Async.pod6

@@ -16,7 +16,7 @@ standard output and error handles, and optionally write to its standard input.
 
 =begin code
 my $file = ‘foo’.IO;
-spurt $file, “and\nCamelia\n♡\nme\n”;
+spurt $file, “Four\nFive\nSix\n”;
 
 my $proc = Proc::Async.new: :w, ‘tac’, ‘--’, $file, ‘-’;
 # my $proc = Proc::Async.new: :w, ‘sleep’, 15; # uncomment to try timeouts
@@ -32,7 +32,7 @@ react {
         say ‘Proc finished. Exit code: ’, .exitcode;
         done # gracefully jump from the react block
     }
-    whenever $proc.print: “I\n♥\nCamelia\n” {
+    whenever $proc.print: “One\nTwo\nThree\n” {
         $proc.close-stdin
     }
     whenever signal(SIGTERM).merge: signal(SIGINT) {