feat: add recommended Java version for Velocity

Supersedes #500.

Author: zlataovce

src/content/docs/velocity/admin/getting-started/faq.md

@@ -9,7 +9,7 @@ many of these questions from the user perspective.
 
 ## What version of Java does Velocity require?
 
-Velocity 3.3.x requires Java 17 or above.
+Velocity 3.3.x requires at least Java 17, however it works best with 21 or above.
 
 ## Where can I find Velocity plugins?
 

src/content/docs/velocity/admin/getting-started/getting-started.md

@@ -8,8 +8,8 @@ This page covers how to install and set up a minimal configuration of Velocity.
 ## Installing Java
 
 Velocity is written in Java, so if you do not already have Java installed, you will need to install
-it before you continue. Velocity requires Java 17 or newer. See our
-[Java installation guide](/misc/java-install) for detailed instructions.
+it before you continue. Velocity requires at least Java 17, however it works best with 21 or above.
+See our [Java installation guide](/misc/java-install) for detailed instructions.
 
 ## Downloading Velocity