docs: added missing 'next steps' sections (angular#52229)

PR Close angular#52229

Author: 1heykal

aio/content/tutorial/tour-of-heroes/toh-pt0.md

@@ -152,4 +152,8 @@ Here are the code files discussed on this page.
 *   You learned that Angular components display data
 *   You used the double curly braces of interpolation to display the application title
 
+## Next steps
+
+*  [1. The hero editor](tutorial/tour-of-heroes/toh-pt1)
+
 @reviewed 2023-08-30

aio/content/tutorial/tour-of-heroes/toh-pt1.md

@@ -221,4 +221,8 @@ Here are the code files discussed on this page.
 *   You imported the `FormsModule` in the `AppModule` so that Angular would recognize and apply the `ngModel` directive.
 *   You learned the importance of declaring components in the `AppModule`.
 
+## Next steps
+
+*  [2. Display a list](tutorial/tour-of-heroes/toh-pt2)
+
 @reviewed 2022-02-28

aio/content/tutorial/tour-of-heroes/toh-pt2.md

@@ -206,4 +206,8 @@ Here are the code files discussed on this page, including the `HeroesComponent`
 * You used `*ngIf` to conditionally include or exclude a block of HTML.
 * You can toggle a CSS style class with a `class` binding.
 
+## Next steps
+
+*  [3. Create a feature component](tutorial/tour-of-heroes/toh-pt3)
+
 @reviewed 2023-08-30

aio/content/tutorial/tour-of-heroes/toh-pt3.md

@@ -155,4 +155,8 @@ Here are the code files discussed on this page.
   to make the `hero` property available for binding
   by the external `HeroesComponent`.
 
+## Next steps
+
+*  [4. Add services](tutorial/tour-of-heroes/toh-pt4)
+
 @reviewed 2023-08-30

aio/content/tutorial/tour-of-heroes/toh-pt4.md

@@ -366,4 +366,8 @@ Here are the code files discussed on this page.
 *   You created a `MessageService` for loosely coupled communication between classes.
 *   The `HeroService` injected into a component is created with another injected service, `MessageService`.
 
+## Next steps
+
+*  [5. Add navigation](tutorial/tour-of-heroes/toh-pt5)
+
 @reviewed 2022-02-28

aio/content/tutorial/tour-of-heroes/toh-pt5.md

@@ -490,4 +490,8 @@ Here are the code files discussed on this page.
 *   You used router link parameters to navigate to the detail view of a user-selected hero
 *   You shared the `HeroService` with other components
 
+## Next steps
+
+*  [6. Get data from a server](tutorial/tour-of-heroes/toh-pt6)
+
 @reviewed 2022-02-28