update andthen example for clarity

Closes #4398

Author: coke

doc/Language/operators.rakudoc

@@ -3432,20 +3432,11 @@ right-hand side won't get executed, unless left-hand side is defined (tip:
 L<C<Failure>|/type/Failure>s are never defined, so you can handle them with
 this operator).
 
-    sub load-data {
-        rand  > .5 or return; # simulated load data failure; return Nil
-        (rand > .3 ?? 'error' !! 'good data') xx 10 # our loaded data
+    "does this match?" ~~ /this/ andthen {
+        $_.say # Using explicit $_ here only for clarity, .say works too
     }
-    load-data.first: /good/ andthen say "$_ is good";
-    # OUTPUT: «(good data is good)␤»
-
-    load-data() andthen .return; # return loaded data, if it's defined
-    die "Failed to load data!!";
-
-The above example will print C<good data is good> only if the subroutine
-returned any items that match C</good/> and will die unless loading data
-returned a defined value. The aliasing behavior lets us pipe the values across
-the operator.
+    "does that match?" ~~ /this/ andthen say 'oops';
+    # OUTPUT: «this␤»
 
 The C<andthen> operator is a close relative of the L«C<with> statement
 modifier|/language/control#with_orwith_without», and some compilers