Re-add syntax highlighting to daily emails and

...ATDC lessons

source/_pages/atdc/4.md

@@ -26,7 +26,7 @@ This will contain the `PostNodeRepository` class that will be responsible for lo
 
 Add this as the initial content:
 
-```php
+```language-php
 <?php
 
 namespace Drupal\atdc\Repository;
@@ -62,7 +62,7 @@ $nodes = $nodeStorage->loadMultiple();
 
 Add them to the `findAll()` method, alter the first line that gets the `EntityTypeManager` (we'll refactor this later) and return the loaded nodes:
 
-```php
+```language-php
 public function findAll(): array {
   $nodeStorage = \Drupal::entityTypeManager()->getStorage('node');
   $nodes = $nodeStorage->loadMultiple();
@@ -73,7 +73,7 @@ public function findAll(): array {
 
 Within the `BlogPageController`, create a constructor method and inject the Repository using constructor property promotion:
 
-```php
+```language-php
 public function __construct(
   private PostNodeRepository $postNodeRepository,
 ) {
@@ -82,7 +82,7 @@ public function __construct(
 
 Add `use Drupal\atdc\Repository\PostNodeRepository;` if needed, and use it to load the post nodes:
 
-```php
+```language-php
 
 public function __invoke(): array {
   $nodes = $this->postNodeRepository->findAll();
@@ -105,7 +105,7 @@ Currently, the test is failing, as the response code is a `500` status because t
 
 It's expected within the constructor, but you must add a `create` method to inject it.
 
-```php
+```language-php
 public static function create(ContainerInterface $container): self {
   return new self(
     $container->get(PostNodeRepository::class),
@@ -123,7 +123,7 @@ To do this, create an `atdc.services.yml` file within your module.
 
 Add `PostNodeRepository` using the fully-qualified class name as the service name:
 
-```yaml
+```language-yaml
 services:
   Drupal\atdc\Repository\PostNodeRepository:
     arguments: []
@@ -139,7 +139,7 @@ Before moving on, let's refactor the `PostNodeRepository` and inject the `Entity
 
 The same as the `BlogPageController`, create a constructor method and inject the `EntityTypeManagerInterface`:
 
-```php
+```language-php
 public function __construct(
   private EntityTypeManagerInterface $entityTypeManager,
 ) {
@@ -148,7 +148,7 @@ public function __construct(
 
 Add the `use Drupal\Core\Entity\EntityTypeManagerInterface;` if needed, and specify it as an argument so it's injected into the constructor:
 
-```yaml
+```language-yaml
 services:
   Drupal\atdc\Repository\PostNodeRepository:
     arguments: