Improves a bit the inheritance example. Closes #620

Author: JJ

doc/Language/classtut.pod6

@@ -474,19 +474,15 @@ other means, such as attribute accessors.
     =begin code
     class Employee {
         has $.salary;
-
-        method pay() {
-            say "Here is \$$.salary";
-        }
     }
 
     class Programmer is Employee {
         has @.known_languages is rw;
         has $.favorite_editor;
 
         method code_to_solve( $problem ) {
-            say "Solving $problem using $.favorite_editor in "
-            ~ $.known_languages[0] ~ '.';
+            return "Solving $problem using $.favorite_editor in "
+            ~ $.known_languages[0];
         }
     }
     =end code
@@ -501,8 +497,8 @@ defined in the Employee class as though they were from the Programmer class.
         favorite_editor => 'vim'
     );
 
-    $programmer.code_to_solve('halting problem');
-    $programmer.pay();
+    say $programmer.code_to_solve('halting problem'), " will get ", $programmer.salary(), "\$";
+    #OUTPUT: «Solving halting problem using vim in Perl5 will get 100000$␤»
     =end code
 
 =head2 Overriding inherited methods