Add Engine::load_module.

doc/src/rust/modules/create.md

@@ -25,7 +25,8 @@ Make the `Module` Available to the `Engine`
 `Engine::load_package` supports loading a [module] as a [package].
 
 Since it acts as a [package], all functions will be registered into the _global_ namespace
-and can be accessed without _module qualifiers_.
+and can be accessed without _namespace qualifiers_.  This is by far the easiest way to expose
+a module's functionalities to Rhai.
 
 ```rust
 use rhai::{Engine, Module};
@@ -41,6 +42,25 @@ engine.eval::<i64>("inc(41)")? == 42;       // no need to import module
 ```
 
 
+Make the `Module` a Global Module
+------------------------------------
+
+`Engine::load_module` loads a [module] and makes it available globally under a specific namespace.
+
+```rust
+use rhai::{Engine, Module};
+
+let mut module = Module::new();             // new module
+module.set_fn_1("inc", |x: i64| Ok(x+1));   // use the 'set_fn_XXX' API to add functions
+
+// Load the module into the Engine as a sub-module named 'calc'
+let mut engine = Engine::new();
+engine.load_module("calc", module);
+
+engine.eval::<i64>("calc::inc(41)")? == 42; // refer to the 'Calc' module
+```
+
+
 Make the `Module` Dynamically Loadable
 -------------------------------------