Move script optimization into separate section.

doc/src/language/modules/export.md

@@ -4,6 +4,16 @@ Export Variables, Functions and Sub-Modules in Module
 {{#include ../../links.md}}
 
 
+The easiest way to expose a package of functions as a self-contained [module] is to do it via a Rhai script itself.
+
+See the section on [_Creating a Module from AST_]({{rootUrl}}/rust/modules/ast.md) for more details.
+
+The script text is evaluated, variables are then selectively exposed via the [`export`] statement.
+Functions defined by the script are automatically exported.
+
+Modules loaded within this module at the global level become _sub-modules_ and are also automatically exported.
+
+
 Export Global Variables
 ----------------------
 

doc/src/language/modules/import.md

@@ -4,6 +4,12 @@ Import a Module
 {{#include ../../links.md}}
 
 
+Before a module can be used (via an `import` statement) in a script, there must be a [module resolver]
+registered into the [`Engine`], the default being the `FileModuleResolver`.
+
+See the section on [_Module Resolvers_][module resolver] for more details.
+
+
 `import` Statement
 -----------------
 

doc/src/language/modules/index.md

@@ -6,13 +6,9 @@ Modules
 Rhai allows organizing code (functions, both Rust-based or script-based, and variables) into _modules_.
 Modules can be disabled via the [`no_module`] feature.
 
-A module is of the type `Module` and encapsulates a Rhai script together with the functions defined
-by that script.
+A module is of the type `Module` and holds a collection of functions, variables, iterators and sub-modules.
+It may be created entirely from Rust functions, or it may encapsulate a Rhai script together with the functions
+and variables defined by that script.
 
-The script text is run, variables are then selectively exposed via the [`export`] statement.
-Functions defined by the script are automatically exported.
-
-Modules loaded within this module at the global level become _sub-modules_ and are also automatically exported.
-
-Other scripts can then load this module and use the variables and functions exported
+Other scripts can then load this module and use the functions and variables exported
 as if they were defined inside the same script.