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docs(context-outlet-typed): update content

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Sven Brodny
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docs/src/content/docs/challenges/angular/4-context-outlet-typed.md
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## Information
Angular offer the static function [`ngTemplateContextGuard`](https://angular.io/guide/structural-directives#typing-the-directives-context) to strongly type structural directive.
You can improve template type checking for custom directives by adding template guard properties to your directive definition. Angular offer the static function [`ngTemplateContextGuard`](https://angular.io/guide/structural-directives#typing-the-directives-context) to strongly type structural directives.
However the context of **NgTemplateOutlet** type is **Object**. But with the help of the above guard, we can improve that behavior.
If you’re not very familiar with `ngTemplateOutlet`, check out this article.
- [NgTemplateOutlet Type Checking](https://medium.com/@thomas.laforge/ngtemplateoutlet-type-checking-5d2dcb07a2c6)
## Statement
In this exercise, we want to learn how to strongly type our ng-template in our AppComponent.
In this exercise we want to learn how to strongly type our `ng-template` in our `AppComponent`.
This exercise has two levels of complexity.
### Level 1: known Interface
### Level 1: Known Interface
Currently we have the following piece of code.
![Unkown Person](../../../../assets/4/unknown-person.png 'Unkown Person')
As we can see, name is of type "any". We want to infer the correct type.
As we can see `name` is of type `any`. We want to infer the correct type using a custom directive `PersonDirective`.
### Level 2: generic Interface
### Level 2: Generic Interface
Currently we have the following piece of code.
![Unkown Student](../../../../assets/4/unknown-student.png 'Unkown Student')
As we can see, student is of type "any". We want to infer the correct type.
As we can see `student` is of type `any`. We want to infer the correct type using a custom directive `ListDirective`.
But in this part, we can pass to ListComponent, a list of **any object**. And we still want the correct type to be inferred.
But in this part, we want to pass a list of **any object** to `ListComponent`. And we still want the correct type to be inferred.