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[ ] feature request
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Current behavior
The code example is a single line using subscribe:

this.route.params.subscribe(p => this.getHero(p && p['id']));

The description talks about the usage of pluck and forEach. They aren't used (probably anymore) in the code. This is misleading.

The expression after route.params chains an Observable operator that plucks the id from the params and then chains a forEach operator to subscribe to id-changing events. The id changes every time the user navigates to a different hero.
The forEach passes the new id value to the component's getHero method (not shown) which fetches a hero and sets the component's hero property. If the id parameter is missing, the pluck operator fails and the catch treats failure as a request to edit a new hero.

Screenshot

Expected behavior
The description should match the code. The description should be replaced or removed.

Affected Files
https://github.com/angular/angular/blob/master/aio/content/examples/testing/src/app/hero/hero-detail.component.ts
https://raw.githubusercontent.com/angular/angular/master/aio/content/guide/testing.md