Further simplify say line of is rw example in Routine.rakudoc (#4625)

Author: raiph

doc/Type/Routine.rakudoc

@@ -245,13 +245,13 @@ sub walk(\thing, *@keys) is rw {
 my %hash;
 walk(%hash, 'some', 'key', 1, 2) = 'autovivified';
 
-say %hash;
+say %hash<some><key>[1][2];
 =end code
 
 produces
 
 =begin code :lang<output>
-{some => {key => [(Any) [(Any) (Any) autovivified]]}}
+autovivified
 =end code
 
 Note that C<return> marks return values as read only; if you need an early exit