Re-add syntax highlighting to daily emails and

...ATDC lessons

source/_daily_emails/2023-08-17.md

@@ -13,7 +13,7 @@ Writing custom assertions is a great way to clean up your test code.
 
 Here's an example from one of my client Drupal projects:
 
-```php
+```language-php
 private static function assertProductVariationHasPrice(ProductVariationInterface $productVariation, string $expectedPrice): void {
   self::assertSame(
     actual: $productVariation->getPrice()->getNumber(),