Add _out of date_ notice to example config

Author: EvilOlaf

config/templates/config-example.conf.template

@@ -5,6 +5,10 @@
 # ./compile.sh example
 # and will output a ready to run image as described below
 
+# ATTENTION:  This file may get out of date since updating the build framework
+#             ("git pull" to say) does not automatically update this file.
+#             To regenerate an up-to-date sample config simply delete this file.
+
 
 BOARD=rock-5b        # Build something for the Radxa ROCK 5B as further specified below
 BRANCH=current       # Use _current_ branch which equals to latest available Linux LTS kernel
@@ -18,4 +22,4 @@ BUILD_MINIMAL=no     # Install common CLI utils
 # advanced
 
 # Use build host DNS server inside chroot instead of default 1.0.0.1
-NAMESERVER=$(grep nameserver /etc/resolv.conf|awk '{ print $2 }'| head -n 1)
+NAMESERVER=$(grep nameserver /etc/resolv.conf|awk '{ print $2 }'| head -n 1)