Itemize the CArray methods.

See issue #1902

doc/Language/nativecall.pod6

@@ -283,6 +283,18 @@ offer you no protection whatsoever here - do the wrong thing, and you will get a
 segfault or cause memory corruption. This isn't a shortcoming of NativeCall, it's
 the way the big bad native world works. Scared? Here, have a hug. Good luck!
 
+=head2 CArray methods
+
+C<CArray> provides the following methods that can be used to interact with the array
+from the Perl 6 point of view:
+
+=item C<elems> provides the number of elements within the array;
+
+=item C<AT-POS> provides a specific element at the given position (starting from zero);
+
+=item C<list> provides the L<List> of elements within the array building it from the
+native array iterator.
+
 =head1 Structs
 
 Thanks to representation polymorphism, it's possible to declare a normal looking