[PHP-WEBMASTER] [web-php] PR #777: Fix code blocks overflowing content.

[leopoletto]

Pull Request: https://github.com/php/web-php/pull/777
Author: leopoletto

This PR fixes the code overflowing content by enabling the horizontal scroll. 

The PHP 8.2 release page has the code content overflowing when accessing via 
mobile, and the same happens on many pages across the documentation, mainly in 
user comments. 

![image](https://github.com/php/web-php/assets/1036401/006b31dc-ae61-4d77-980b-91436824e1d8)
![image](https://github.com/php/web-php/assets/1036401/dd862570-06d8-4c05-95de-a65a29c418a2)

The result looks like this:

![image](https://github.com/php/web-php/assets/1036401/228e8734-f8f8-412f-b465-2cd443f7b219)
![image](https://github.com/php/web-php/assets/1036401/60811457-6e0f-4d97-8a60-0c398d6f5111)

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