Update i3blocks.conf

thanks to @SidRoberts  mentioning this here:
https://github.com/endeavouros-team/endeavouros-i3wm-setup/pull/50

.config/i3/i3blocks.conf

@@ -140,6 +140,8 @@ interval=1
 # display keyboard layout name
 # for keyboard layouts switcher
 # see i3 config file
+# this needs xkblayout-state installed from the AUR:
+# https://aur.archlinux.org/packages/xkblayout-state-git
 #[keyboard-layout]
 #command=~/.config/i3/scripts/keyboard-layout
 #interval=2