Bug#290872: remove obsolete notes in "C.1. Preconfiguration File Example"

[Holger Levsen <holger@layer-acht.org>]

package: debian-installer-manual

Hi,

C.1. Preconfiguration File Example contains two notes, which are obsolete now:

##### Preseeding base-config.
# XXX: Note that most of this will not work right until base-config 2.40.4
# is available.

and 

###### Package selection.
#...
# XXX: this will not work until tasksel 2.12 is available

In sarge tasksel is at 2.15 and base-config is at 2.53.5 - so these warnings 
can be removed.


regards,
 Holger