Add php8 to the summary.

I left the other part until we actually cut 5.40 due to the framing

docs/general/requirements.md

@@ -10,8 +10,8 @@ A recommended server environment should typically meet these guidelines:
 
 * __Operating system__: Linux
 * __CMS__: Backdrop, Drupal 7, Drupal 8/9, Joomla, or WordPress
-* __PHP__: 7.2 or 7.3 -- with configuration and extension requirements
-* __MySQL__: MySQL 5.7+ or MariaDB 10.0+ -- with configuration requirements
+* __PHP__: 7.2, 7.3, 7.4 -- with configuration and extension requirements. Php 8 is supported from 5.40.
+* __MySQL__: MySQL 5.7.5+ or MariaDB 10.0.0.2+ -- with configuration requirements
 
 Other environments may also meet the system requirements. The following sections present requirements more precisely.