message: docs: fix doc linter warnings in `app-shell.md`
  PR Close
diff: @@ -9,7 +9,7 @@ Learn more in [The App Shell Model](https://developers.google.com/web/fundamenta
  ## Step 1: Prepare the application
  -Do this with the following CLI command:
  +Do this with the following Angular CLI command:
  <code-example format="shell" language="shell">
  @@ -19,9 +19,9 @@ ng new my-app --routing
  For an existing application, you have to manually add the `RouterModule` and defining a `<router-outlet>` within your application.
  -## Step 2: Create the app shell
  +## Step 2: Create the application shell
  -Use the CLI to automatically create the application shell.
  +Use the Angular CLI to automatically create the application shell.
  <code-example format="shell" language="shell">
  @@ -80,9 +80,9 @@ After running this command you can see that the `angular.json` configuration fil
  </code-example>
  -## Step 3: Verify the app is built with the shell content
  +## Step 3: Verify the application is built with the shell content
  -Use the CLI to build the `app-shell` target.
  +Use the Angular CLI to build the `app-shell` target.
  <code-example format="shell" language="shell">
  