docs/manual: no longer mention the package/customize thing

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Acked-by: Luca Ceresoli <luca@lucaceresoli.net>
Acked-by: "Samuel Martin" <s.martin49@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

docs/manual/customize-rootfs.txt

@@ -50,12 +50,6 @@ there are a few ways to customize the resulting target filesystem.
       stored
     - +BASE_DIR+: the base output directory
 
-* A special package, 'customize', stored in +package/customize+ can be
-  used. You can put all the files that you want to see in the final
-  target root filesystem in +package/customize/source+, and then
-  enable this special package in the configuration system. _This
-  method is marked as deprecated_.
-
 Note also that if you want to perform some specific actions *after*
 all filesystem images have been created (for example to automatically
 extract your root filesystem tarball in a location exported by your