[PHP-WEBMASTER] [web-php] PR #1214: Add scroll padding for anchor links

[xPaw]

Pull Request: https://github.com/php/web-php/pull/1214
Author: xPaw

On pages with sticky breadcrumbs, this fixes the anchored link to scroll less 
to account for the stickied header.

Example link to try on: 
https://www.php.net/manual/en/opcache.configuration.php#ini.opcache.blacklist-filename

Before:
![image](https://github.com/user-attachments/assets/9daf3476-23e4-49c9-98ab-fdf5ff20e889)

After:
![image](https://github.com/user-attachments/assets/64be40c3-899b-4d70-a6af-3137e6fe5b46)