explain importance of the config space.

doc/fai-guide.txt

@@ -5,7 +5,7 @@
 FAI Guide (Fully Automatic Installation)
 ========================================
 Thomas Lange <lange@informatik.uni-koeln.de>
-Mon, 29 Aug 2019
+Mon, 6 Sep 2019
 :Date: a date
 :Revision: 5.8
 
@@ -372,7 +372,9 @@ config space for short. It includes information about:
 +
 The package _fai-doc_ includes a sample configuration space including
 examples for hosts using the XFCE and GNOME environment amongst other
-examples.
+examples. Calling `fai-mk-configspace` copies these examples to
+'/srv/fai/config'. It's recommended to study those config files and
+scripts for easier understanding how FAI works.
 
 
 nfsroot, NFS-Root::
@@ -1125,13 +1127,13 @@ package installed by class FAIBASE:
 # example of how to override:
 #
 # On FAIBASE we have:
-#    PACKAGE install-norec
+#    PACKAGES install-norec
 #    linuxlogo
 #
 # We want to _not_ install linuxlogo, and it is in a
 # install-norec section, so we must also use install-norec.
 
-PACKAGE install-norec
+PACKAGES install-norec
 linuxlogo-
 ----