d/control: fix descriptions and long descriptions of libip[46]tc

Fix descriptions and long descriptions of libiptc, libip4tc and libip6tc.
Reported-by: Michael Biebl <biebl@debian.org>
Signed-off-by: Arturo Borrero Gonzalez <arturo@debian.org>

debian/control

@@ -82,9 +82,11 @@ Architecture: linux-any
 Section: libs
 Pre-Depends: ${misc:Pre-Depends}
 Depends: ${misc:Depends}, ${shlibs:Depends}
-Description: netfilter libipt library
+Description: netfilter libiptc library
  The user-space iptables C library from the Netfilter xtables framework.
  .
+ iptables v4/v6 ruleset ADT and kernel interface.
+ .
  This library has been considered private for years (and still is), in the
  sense of changing symbols and backward compatibility not guaranteed.
 
@@ -114,9 +116,11 @@ Architecture: linux-any
 Section: libs
 Pre-Depends: ${misc:Pre-Depends}
 Depends: ${misc:Depends}, ${shlibs:Depends}
-Description: netfilter libi4pt library
+Description: netfilter libip4tc library
  The user-space iptables (IPv4) C library from the Netfilter xtables framework.
  .
+ iptables IPv4 ruleset ADT and kernel interface.
+ .
  This library has been considered private for years (and still is), in the
  sense of changing symbols and backward compatibility not guaranteed.
 
@@ -130,7 +134,7 @@ Depends: libip4tc0 (=${binary:Version}),
 Replaces: iptables-dev (<< 1.6.0-3)
 Breaks: iptables-dev (<< 1.6.0-3)
 Section: libdevel
-Description: Development files for libiptc
+Description: Development files for libip4tc
  The user-space iptables (IPv4) C library from the Netfilter xtables framework.
  .
  This library has been considered private for years (and still is), in the
@@ -145,9 +149,11 @@ Architecture: linux-any
 Section: libs
 Pre-Depends: ${misc:Pre-Depends}
 Depends: ${misc:Depends}, ${shlibs:Depends}
-Description: netfilter libipt library
+Description: netfilter libip6tc library
  The user-space iptables (IPv6) C library from the Netfilter xtables framework.
  .
+ iptables IPv6 ruleset ADT and kernel interface.
+ .
  This library has been considered private for years (and still is), in the
  sense of changing symbols and backward compatibility not guaranteed.
 
@@ -161,7 +167,7 @@ Depends: libip6tc0 (=${binary:Version}),
 Replaces: iptables-dev (<< 1.6.0-3)
 Breaks: iptables-dev (<< 1.6.0-3)
 Section: libdevel
-Description: Development files for libiptc
+Description: Development files for libip6tc
  The user-space iptables (IPv6) C library from the Netfilter xtables framework.
  .
  This library has been considered private for years (and still is), in the