Re-add syntax highlighting to daily emails and

...ATDC lessons

source/_daily_emails/2023-04-26.md

@@ -21,7 +21,7 @@ Maybe a user was pending initially, and they're active after running a command o
 
 To help me get started, I'll sometimes write a test like this with placeholders to separate the test into its separate stages:
 
-```php
+```language-php
 /** @test */
 function should_activate_a_pending_user(): void {
   // Arrange.
@@ -38,7 +38,7 @@ This makes me think about the different stages and what each might need to conta
 
 Or I might write it out in the "Given, When, Then" format:
 
-```php
+```language-php
 /** @test */
 function should_activate_a_pending_user(): void {
   // Given I have a user.