ThreadPoolScheduler.cue takes Callable as first positional

And not as named argument.

Author: lizmat

doc/Type/Scheduler.pod6

@@ -27,7 +27,7 @@ code that is being scheduled and run.
 
 =head2 method cue
 
-    method cue(:&code, Instant :$at, :$in, :$every, :$times = 1; :&catch)
+    method cue(&code, Instant :$at, :$in, :$every, :$times = 1; :&catch)
 
 Schedules a callable (C<&code>) for execution. The adverbs control when and
 how the code is run: