Merge pull request #701 from City-of-Helsinki/UHF-X_config_override_d…

…ocumentation

Update development.md

documentation/development.md

@@ -229,11 +229,28 @@ The update hook above will re-import all configuration from `helfi_media` module
 
 The `helfi_platform_config.config_update_helper` invokes `hook_rewrite_config_update`, which allows custom modules to react to config re-importing.
 
+##### In this example we would want to override Text paragraph label with a configuration found in my_module. 
+
+To trigger the `hook_rewrite_config_update`, implement the hook to your `my_module.module`:
 ```php
-function helfi_kasko_content_rewrite_config_update(string $module, Drupal\config_rewrite\ConfigRewriterInterface $configRewriter): void {
-  if ($module === 'helfi_tpr_config') {
-    // Rewrite helfi_tpr_config configuration.
-    $configRewriter->rewriteModuleConfig('helfi_kasko_content');
+function my_module_rewrite_config_update(string $module, Drupal\config_rewrite\ConfigRewriterInterface $configRewriter): void {
+  if ($module === 'helfi_paragraphs_text') {
+    // Rewrite helfi_paragraphs_text configuration.
+    $configRewriter->rewriteModuleConfig('my_module');
   }
 }
 ```
+This hook will trigger when `\Drupal::service('helfi_platform_config.config_update_helper')->update('helfi_paragraphs_text');` is run and it will search for configurations in `my_module/config/rewrite/` folder.
+
+To override configurations for your Drupal instance, follow the instructions found in [Rewrite module project page](https://www.drupal.org/project/config_rewrite).
+
+In our example, the label change would be implemented in a configuration file `/public/modules/custom/my_module/config/rewrite/paragraphs.paragraphs_type.text.yml`:
+```yml
+label: Text (override)
+```
+The label change for the Finnish translation would be implemented in a configuration file `/public/modules/custom/my_module/config/rewrite/language/fi/paragraphs.paragraphs_type.text.yml`
+```yml
+label: Teksti (ylikirjoitettu)
+```
+
+