Specify that Zephyr development needs Linux

Author: erlingrj

docs/embedded/zephyr.mdx

@@ -17,7 +17,7 @@ different LF Zephyr projects can be hosted together with a single copy of the
 Zephyr RTOS sources.
 
 ## Prerequisites
-- Linux or macOS development system. (The guide is written for Linux)
+- Linux development system (The guide was written and tested for Ubuntu 24.04)
 - nrf52 Development Kit (optional)
 
 # Getting started