Drafts general structure of nativetypes page

And improves a bit the other data structures page. Refs #114, but also #2051

Author: JJ

doc/Language/nativetypes.pod6

@@ -1,6 +1,6 @@
 =begin pod :tag<perl6>
 
-=TITLE Perl 6 native types
+=TITLE Perl 6 native types
 
 =SUBTITLE Using the types the compiler and hardware make available to you.
 
@@ -14,6 +14,13 @@ TBD
 
 =head1 C<structs>
 
+TBD
+
+=head1 Native representation
+
+TBD
+
+
 =end pod
 
 # vim: expandtab softtabstop=4 shiftwidth=4 ft=perl6

doc/Language/structures.pod6

@@ -23,6 +23,10 @@ TBD
 
 TBD
 
+=head1 Defining and constraining data structures
+
+TBD
+
 =end pod
 
 # vim: expandtab softtabstop=4 shiftwidth=4 ft=perl6