set prv.key doc update

docs/cli_commands.md

@@ -294,7 +294,7 @@ This document provides an overview of CLI commands that can be sent to MeshCore
 
 **Serial Only:**
 - `get prv.key`: Yes
-- `set prv.key`: Yes
+- `set prv.key`: No
 
 **Note:** Requires reboot to take effect after setting