Re-add syntax highlighting to daily emails and

...ATDC lessons

source/_daily_emails/2022-11-14.md

@@ -10,7 +10,7 @@ tags:
 
 When writing object-orientated code, particularly in PHP, you usually write method names using camel-case letters - such as:
 
-```php
+```language-php
 public function doSomething(): void {
   // ...
 }
@@ -18,7 +18,7 @@ public function doSomething(): void {
 
 This is also true when writing methods within a test class - only that the method name is prefixed with the word `test`:
 
-```php
+```language-php
 public function testSomething(): void {
 }
 ```
@@ -27,7 +27,7 @@ This is probably expected and complies with the PSR code style standards like PS
 
 Something that I've seen some PHP developers and some frameworks prefer is to write their test methods using snake-case letters and  commonly removing the `test` prefix in favour of using an annotation:
 
-```php
+```language-php
 /** @test */
 public function the_api_should_return_a_200_response_code_if_everything_is_ok(): void {
   // ...