refactor(docs-infra): remove linenums=false since it is now the default (#31674)

PR Close #31674

aio/content/start/forms.md

@@ -2,7 +2,7 @@
 
 At the end of [Managing Data](start/data "Getting Started: Managing Data"), the online store application has a product catalog and a shopping cart.
 
-In this section, you'll finish the app by adding a form-based checkout feature. You'll create a form to collect user information as part of checkout. 
+In this section, you'll finish the app by adding a form-based checkout feature. You'll create a form to collect user information as part of checkout.
 
 ## Forms in Angular
 
@@ -10,11 +10,11 @@ Forms in Angular take the standard capabilities of the HTML based forms and add
 
 ## Define the checkout form model
 
-First, you'll set up the checkout form model. The form model is the source of truth for the status of the form and is defined in the component class. 
+First, you'll set up the checkout form model. The form model is the source of truth for the status of the form and is defined in the component class.
 
 1. Open `cart.component.ts`.
 
-1. Angular's `FormBuilder` service provides convenient methods for generating controls. As with the other services you've used, you need to import and inject the service before you can use it: 
+1. Angular's `FormBuilder` service provides convenient methods for generating controls. As with the other services you've used, you need to import and inject the service before you can use it:
 
     1. Import the `FormBuilder` service from the `@angular/forms` package.
 
@@ -23,7 +23,7 @@ First, you'll set up the checkout form model. The form model is the source of tr
 
       The `FormBuilder` service is provided by the `ReactiveFormsModule`, which is already defined in the `AppModule` you modified previously (in `app.module.ts`).
 
-    1. Inject the `FormBuilder` service. 
+    1. Inject the `FormBuilder` service.
 
       <code-example header="src/app/cart/cart.component.ts" path="getting-started/src/app/cart/cart.component.ts" region="inject-form-builder">
       </code-example>
@@ -35,14 +35,13 @@ First, you'll set up the checkout form model. The form model is the source of tr
 
 1. During checkout, the app will prompt the user for a name and address. So that you can gather that information later, set the `checkoutForm` property with a form model containing `name` and `address` fields, using the `FormBuilder#group()` method.
 
-    <code-example header="src/app/cart/cart.component.ts" path="getting-started/src/app/cart/cart.component.ts" region="checkout-form-group" linenums="false">
-    </code-example>
+    <code-example header="src/app/cart/cart.component.ts" path="getting-started/src/app/cart/cart.component.ts" region="checkout-form-group"></code-example>
 
-1. For the checkout process, users need to be able to submit the form data (their name and address). When the order is submitted, the form should reset and the cart should clear. 
+1. For the checkout process, users need to be able to submit the form data (their name and address). When the order is submitted, the form should reset and the cart should clear.
 
-    In `cart.component.ts`, define an `onSubmit()` method to process the form. Use the `CartService#clearCart()` method to empty the cart items and reset the form after it is submitted. (In a real-world app, this method also would submit the data to an external server.) 
+    In `cart.component.ts`, define an `onSubmit()` method to process the form. Use the `CartService#clearCart()` method to empty the cart items and reset the form after it is submitted. (In a real-world app, this method also would submit the data to an external server.)
 
-    The entire cart component is shown below: 
+    The entire cart component is shown below:
 
     <code-example header="src/app/cart/cart.component.ts" path="getting-started/src/app/cart/cart.component.ts">
     </code-example>
@@ -51,13 +50,13 @@ The form model is defined in the component class. To reflect the model in the vi
 
 ## Create the checkout form
 
-Next, you'll add a checkout form at the bottom of the "Cart" page. 
+Next, you'll add a checkout form at the bottom of the "Cart" page.
 
 1. Open `cart.component.html`.
 
-1. At the bottom of the template, add an empty HTML form to capture user information. 
+1. At the bottom of the template, add an empty HTML form to capture user information.
 
-1. Use a `formGroup` property binding to bind the `checkoutForm` to the `form` tag in the template. Also include a "Purchase" button to submit the form. 
+1. Use a `formGroup` property binding to bind the `checkoutForm` to the `form` tag in the template. Also include a "Purchase" button to submit the form.
 
   <code-example header="src/app/cart/cart.component.html" path="getting-started/src/app/cart/cart.component.3.html" region="checkout-form">
   </code-example>
@@ -67,12 +66,12 @@ Next, you'll add a checkout form at the bottom of the "Cart" page.
   <code-example path="getting-started/src/app/cart/cart.component.html" region="checkout-form-1">
   </code-example>
 
-1. Add input fields for `name` and `address`.  Use the `formControlName` attribute binding to bind the `checkoutForm` form controls for `name` and `address` to their input fields. The final complete component is shown below: 
+1. Add input fields for `name` and `address`.  Use the `formControlName` attribute binding to bind the `checkoutForm` form controls for `name` and `address` to their input fields. The final complete component is shown below:
 
   <code-example path="getting-started/src/app/cart/cart.component.html" region="checkout-form-2">
   </code-example>
 
-After putting a few items in the cart, users can now review their items, enter name and address, and submit their purchase: 
+After putting a few items in the cart, users can now review their items, enter name and address, and submit their purchase:
 
 <figure>
   <img src='generated/images/guide/start/cart-with-items-and-form.png' alt="Cart page with checkout form">