CVS srivasta: Move the error unwind eaxmple out the item in the postinst script

[Debian Policy CVS <jdg-policy-cvs@debian.org>]

CVSROOT:	/cvs/debian-policy
Module name:	debian-policy
Changes by:	srivasta	Fri Feb  4 16:44:55 MST 2005

Modified files:
	debian         : rules changelog 
	.              : policy.sgml 

Log message:
  Move the error unwind eaxmple out the item in the postinst script
  usage section. Delete generated files in the clean target
  (policy.{pdf,ps,tpt,txt} are generated files)