add todo item

doc/contributors/doc.rst

@@ -1,7 +1,7 @@
 
 
-Documentation
-=============
+Contributing to the documentation
+=================================
 
 This documentation is refreshed upon each push to the central repository.
 
@@ -9,3 +9,7 @@ The module reference documentation is generated from the module sources using
 ``#.rst:`` tags (compare for instance
 http://autocmake.readthedocs.org/en/latest/module-reference.html#cc-cmake with
 https://github.com/scisoft/autocmake/blob/master/modules/cc.cmake).
+
+.. todo::
+
+   Mention the possibility to infer autocmake.cfg code from the documentation.