Re-add syntax highlighting to daily emails and

...ATDC lessons

source/_daily_emails/2023-12-25.md

@@ -41,7 +41,7 @@ Before adding tests, you must create a module to place them in.
 
 Run `mkdir -p web/modules/custom/atdc` to create an empty module directory, and create an `atdc.info.yml` file within it with this content:
 
-```yaml
+```language-yaml
 name: Example
 type: module
 core_version_requirement: ^10
@@ -58,7 +58,7 @@ Run `mkdir -p web/modules/custom/atdc/tests/src/Functional && touch web/modules/
 
 Then, add this content.
 
-```php
+```language-php
 <?php
 
 namespace Drupal\Tests\atdc\Functional;
@@ -77,7 +77,7 @@ Note: within a test class, the namespace is `Drupal\Tests\{module_name}` instead
 
 With the boilerplate class added, create a test method within it:
 
-```php
+```language-php
 public function testBasic(): void {
   self::assertTrue(FALSE);
 }
@@ -148,7 +148,7 @@ As you're writing functional tests by extending `BrowserTestBase`, you can make
 
 Replace the `testBasic` test method with the following:
 
-```php
+```language-php
 public function testFrontPage(): void {
   $this->drupalGet('/');