Add TODO markers

so that a "git grep TODO" detects that there is something
to do in this file

Author: moritz

lib/Language/variables.pod

@@ -419,12 +419,20 @@ introduce an alias into the symbol table.
 
 =head2 The C<anon> Declarator
 
+=comment TODO
+
 =head2 The C<state> Declarator
 
+=comment TODO
+
 =head2 The C<augment> Declarator
 
+=comment TODO
+
 =head2 The C<supersede> Declarator
 
+=comment TODO
+
 =head2 The C<temp> Prefix
 
 Like C<my>, C<temp> restores the old value of a variable at the end of its