Allow "WHAT" to appear in this example

Closer to the JS code that ^name would be.

Author: coke

doc/Language/js-nutshell.pod6

@@ -263,7 +263,7 @@ property on Node.js objects in Perl 6 is the C<WHAT> attribute:
 console.log('foo'.constructor); // OUTPUT: String
 =end code
 
-=begin code
+=begin code :ok-test<WHAT>
 say 'foo'.WHAT; # OUTPUT: Str
 =end code