Add link to armbian-config

Author: dleidert

docs/User-Guide_Advanced-Configuration.md

@@ -177,6 +177,8 @@ Zswap performs a lot better than the combination of ZRAM and 'swap on disk' in p
 
 ## Switch kernels
 
+This is typically handled by [_armbian-config_](User-Guide_Armbian-Config/System.md#alternative-kernels).
+
 ```bash
 armbian-config --cmd KER001
 ```