Update docs regarding modules.

doc/src/language/modules/export.md

@@ -22,6 +22,8 @@ The `export` statement, which can only be at global level, exposes selected vari
 
 Variables not exported are _private_ and hidden to the outside.
 
+Everything exported from a module is **constant** (**read-only**).
+
 ```rust
 // This is a module script.
 
@@ -49,8 +51,6 @@ All functions are automatically exported, _unless_ it is explicitly opt-out with
 
 Functions declared [`private`] are hidden to the outside.
 
-Everything exported from a module is **constant** (**read-only**).
-
 ```rust
 // This is a module script.