Adds .perl refs #2632

Added the fact that .perl can be called on multi-dimensional arrays since version 6.2

doc/Type/Array.pod6

@@ -12,6 +12,8 @@ scalar containers, which means you can assign to array elements.
 C<Array> implements C<Positional> and as such provides support for
 L<subscripts|/language/subscripts>.
 
+B<Note> from version 6.2, C<.perl> can be called on multi-dimensional arrays.
+
 =head1 Methods
 
 =head2 method gist