message: docs: add ngOnInit description
  PR Close
diff: @@ -90,9 +90,17 @@ The product details component handles the display of each product. The Angular R
  <code-example path="getting-started/src/app/product-details/product-details.component.1.ts" region="get-product">
  </code-example>
  + Angular calls `ngOnInit()` shortly after creating a component.
  +
  The route parameters correspond to the path variables defined in the route. The `productId` is provided from
  the URL that was matched to the route. You use the `productId` to display the details for each unique product.
  + <div class="alert is-helpful">
  +
  + For more information on `ngOnInit()`, see [Lifecycle hooks](guide/lifecycle-hooks).
  +
  + </div>
  +
  1. Update the template to display product details information inside an `*ngIf`.
  <code-example header="src/app/product-details/product-details.component.html" path="getting-started/src/app/product-details/product-details.component.html" region="details">
  