Lua documentation tweaks and make nspace example more concise.

Examples/lua/nspace/example.h

@@ -7,20 +7,15 @@ int module_variable = 9;
 namespace MyWorld {
   class World {
   public:
-    World():
-      world_max_count(9) {}
+    World() : world_max_count(9) {}
     int create_world() { return 17; }
     const int world_max_count; // = 9
   };
   namespace Nested {
     class Dweller {
       public:
-        Dweller():
-          food_count(11) {}
         enum Gender { MALE = 0, FEMALE = 1 };
-        static int populate_cave() { return 19; }
-        int create_cave() { return 13; }
-        int food_count; // = 11
+        static int count() { return 19; }
     };
   }
 }