message: docs: fix the property name in the example
  AppHighlight directive from the example doesn't have myHighlight attribute.
  It only has appHighlight property. So we should use appHighlight instead of myHighlight.
  PR Close
diff: @@ -210,7 +210,7 @@ Angular sets the constructor's `el` parameter to the injected `ElementRef`.
  (An `ElementRef` is a wrapper around a DOM element,
  whose `nativeElement` property exposes the DOM element for the directive to manipulate.)
  -The sample code applies the directive's `myHighlight` attribute to two `<div>` tags,
  +The sample code applies the directive's `appHighlight` attribute to two `<div>` tags,
  first without a value (yielding the default color) and then with an assigned color value.
  <code-example path="dependency-injection-in-action/src/app/app.component.html" region="highlight" header="src/app/app.component.html (highlight)"></code-example>
  