revert incorrect changes

docs/en/API/Dynamic-CSharp-API-Clients.md

@@ -1,3 +1,5 @@
+# Dynamic C# API Clients
+
 ABP can dynamically create C# API client proxies to call remote HTTP services (REST APIs). In this way, you don't need to deal with `HttpClient` and other low level HTTP features to call remote services and get results.
 
 ## Service Interface

docs/en/UI/AspNetCore/Client-Side-Package-Management.md

@@ -1,3 +1,6 @@
+
+## ASP.NET Core MVC Client Side Package Management
+
 ABP framework can work with any type of client side package management systems. You can even decide to use no package management system and manage your dependencies manually.
 
 However, ABP framework works best with **NPM/Yarn**. By default, built-in modules are configured to work with NPM/Yarn.
@@ -110,4 +113,4 @@ When you run the `gulp`, all packages will copy their own resources into the **w
 #### See Also
 
 * [Bundling & Minification](Bundling-Minification.md)
-* [Theming](Theming.md)
+* [Theming](Theming.md)

docs/en/UI/AspNetCore/Widgets.md

@@ -1,3 +1,7 @@
+# Widgets
+
+ABP provides a model and infrastructure to create **reusable widgets**. Widget system is an extension to [ASP.NET Core's ViewComponents](https://docs.microsoft.com/en-us/aspnet/core/mvc/views/view-components). Widgets are especially useful when you want to;
+
 * Have **scripts & styles** dependencies for your widget.
 * Create **dashboards** with widgets used inside.
 * Define widgets in reusable **[modules](../Module-Development-Basics.md)**.