Update navigation.md

docs/WinUI/navigation.md

@@ -4,9 +4,9 @@
 
 The `NavigationService` is in charge of handling the navigation between app pages.
 
-`NavigationService` is a class consumed using IoC that uses the `NavigateTo` method to navigate between pages. It uses the page key as a parameter. These page keys are registered in the `PageService` constructor and correspond to the Page ViewModel `FullName`.
+`NavigationService` is a class consumed using IoC that uses the `NavigateTo` method to navigate between pages. It uses the page key as a parameter. These page keys are registered in the `PageService` constructor and correspond to the Page's ViewModel `FullName`.
 
-All pages ViewModels can extend from `INavigationAware` interface to run code on navigation events.
+All ViewModels can implement the `INavigationAware` interface to execute code on navigation events.
 
 ```csharp
 public class MainViewModel : ObservableRecipient, INavigationAware
@@ -25,7 +25,7 @@ public class MainViewModel : ObservableRecipient, INavigationAware
 
 ## Navigation initialization
 
-The `ActivateAsync` method in the `ActivationService` class tries to get a `ShellPage` from the `IoC`, if the shell is not registered in the `ConfigureServices` method from the `App` file the `App.MainWindow` content will be initialized as a new Frame.
+The `ActivateAsync` method in the `ActivationService` class tries to get a `ShellPage` from the `IoC` and set the content of the applications MainWindow (`App.MainWindow`) to the ShellPage. If the ShellPage is not registered in the `ConfigureServices` method from the `App.xaml.cs` file, the content of the MainWindow will be set to a new Frame.
 
 Classes that extend from `ActivationHandler` can perform the first navigation in the App, if it doesn't happen, the `DefaultActivationHandler` navigates to the home page.
 
@@ -33,7 +33,7 @@ Classes that extend from `ActivationHandler` can perform the first navigation in
 
 ### Navigation Pane
 
-This project type adds a ShellPage that sets NavigationService frame to a frame within the NavigationView. The NavigationService will do future navigation in this frame.
+This project type adds a ShellPage that sets the NavigationService's frame to a frame within the NavigationView on the ShellPage. The NavigationService will do future navigation in this frame.
 
 ```xml
 <Page>