Re-add syntax highlighting to daily emails and

...ATDC lessons

source/_daily_emails/2022-09-14.md

@@ -10,7 +10,7 @@ I cloned a fresh version of my [Docker Examples repository](https://github.com/o
 
 I ran `mkdir -p web/modules/custom/example/tests/src/Functional` to create the directory structure that I needed, and then `touch web/modules/custom/example/tests/src/Functional/ExampleTest.php` to create a new test file and populated it with some initial code:
 
-```php
+```language-php
 <?php
 
 namespace Drupal\Tests\example\Functional;
@@ -27,7 +27,7 @@ class ExampleTest extends BrowserTestBase {
 
 For the simplest test, I decided to test some existing Drupal core functionality - that an anonymous user can view the front page:
 
-```php
+```language-php
 /** @test */
 public function the_front_page_loads_for_anonymous_users() {
   $this->drupalGet('<front>');
@@ -42,7 +42,7 @@ As this is existing functionalty, the test passes. I can change either the path
 
 With the first test working, it's easy to add more for other functionality, such as whether different users should be able to access administration pages:
 
-```php
+```language-php
 /** @test */
 public function the_admin_page_is_not_accessible_to_anonymous_users() {
   $this->drupalGet('admin');