Add a line and example to the documentation covering the need to require the autoloader file in order to use autoloaded files

doc/articles/scripts.md

@@ -82,6 +82,8 @@ For any given event:
 and command-line executable commands.
 - PHP classes containing defined callbacks must be autoloadable via Composer's
 autoload functionality.
+- If a defined callback relies on functions defined outside of a class, the callback
+must explicitly require the composer autoloader.
 
 Script definition example:
 
@@ -121,6 +123,14 @@ class MyClass
         $composer = $event->getComposer();
         // do stuff
     }
+    
+    public static function postAutoloadDump(Event $event)
+    {
+        $vendorDir = $event->getComposer()->getConfig()->get('vendor-dir');
+        require "$vendorDir/autoload.php";
+        
+        some_function_from_an_autoloaded_file();
+    }
 
     public static function postPackageInstall(PackageEvent $event)
     {