Bug#252392: debian-policy: Small wording change

[Mike Paul <mbp2@lehigh.edu>]

Package: debian-policy
Version: 3.6.1.0
Severity: minor

Section 4.3 of the policy ends with the sentence "This makes it
impossible for someone else to later reconfigure the package."  It's not
too difficult to figure out what is meant by this, but for the sake of
clarity, wording like "without losing the Debian-specific changes"
should be added to the end of this sentence.

-- System Information:
Debian Release: testing/unstable
  APT prefers unstable
  APT policy: (990, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)
Kernel: Linux 2.6.6
Locale: LANG=C, LC_CTYPE=C

-- no debconf information