ENGCOM-5657: ReadMe minor changes previous pr #24177

Author: sidolov

app/code/Magento/AdminNotification/README.md

@@ -4,15 +4,25 @@ The Magento_AdminNotification module provides the ability to alert administrator
 
 ## Installation details
 
+The Magento_AdminNotification module creates the following tables in the database:
+- `adminnotification_inbox`
+- `admin_system_messages`
+
 Before disabling or uninstalling this module, note that the Magento_Indexer module depends on this module.
 
 For information about module installation in Magento 2, see [Enable or disable modules](https://devdocs.magento.com/guides/v2.3/install-gde/install/cli/install-cli-subcommands-enable.html).
 
+## Extensibility
+
+Extension developers can interact with the Magento_AdminNotification module. For more information about the Magento extension mechanism, see [Magento plug-ins](https://devdocs.magento.com/guides/v2.3/extension-dev-guide/plugins.html).
+
+[The Magento dependency injection mechanism](https://devdocs.magento.com/guides/v2.3/extension-dev-guide/depend-inj.html) enables you to override the functionality of the Magento_AdminNotification module.
+
 ### Events
 
 This module observes the following events:
 
- - `controller_action_predispatch` event in `Magento\AdminNotification\Observer\PredispatchAdminActionControllerObserver`
+ - `controller_action_predispatch` event in `Magento\AdminNotification\Observer\PredispatchAdminActionControllerObserver` file.
 
 ### Layouts
 

app/code/Magento/AdvancedPricingImportExport/README.md

@@ -2,3 +2,8 @@
 
 The Magento_AdvancedPricingImportExport module handles the import and export of the advanced pricing.
 
+## Extensibility
+
+Extension developers can interact with the Magento_AdvancedPricingImportExport module. For more information about the Magento extension mechanism, see [Magento plug-ins](https://devdocs.magento.com/guides/v2.3/extension-dev-guide/plugins.html).
+
+[The Magento dependency injection mechanism](https://devdocs.magento.com/guides/v2.3/extension-dev-guide/depend-inj.html) enables you to override the functionality of the Magento_AdvancedPricingImportExport module.