[Bug 1702385] [NEW] add information about return codes to manpage

[Karl-Philipp Richter]

Public bug reported:

The manpage of `wdiff` doesn't contain any information about return
codes which are crucial for working with the program.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: wdiff 1.2.2-2
ProcVersionSignature: Ubuntu 4.10.0-26.30-generic 4.10.17
Uname: Linux 4.10.0-26-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.4-0ubuntu4.1
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed Jul  5 03:15:17 2017
Dependencies:
 gcc-6-base 6.3.0-12ubuntu2
 libc6 2.24-9ubuntu2.2
 libgcc1 1:6.3.0-12ubuntu2
 libtinfo5 6.0+20160625-1ubuntu1
InstallationDate: Installed on 2015-12-12 (570 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: wdiff
UpgradeStatus: Upgraded to zesty on 2017-05-01 (64 days ago)

** Affects: wdiff (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug zesty

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https://bugs.launchpad.net/bugs/1702385

Title:
  add information about return codes to manpage

Status in wdiff package in Ubuntu:
  New

Bug description:
  The manpage of `wdiff` doesn't contain any information about return
  codes which are crucial for working with the program.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: wdiff 1.2.2-2
  ProcVersionSignature: Ubuntu 4.10.0-26.30-generic 4.10.17
  Uname: Linux 4.10.0-26-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.4-0ubuntu4.1
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Wed Jul  5 03:15:17 2017
  Dependencies:
   gcc-6-base 6.3.0-12ubuntu2
   libc6 2.24-9ubuntu2.2
   libgcc1 1:6.3.0-12ubuntu2
   libtinfo5 6.0+20160625-1ubuntu1
  InstallationDate: Installed on 2015-12-12 (570 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  SourcePackage: wdiff
  UpgradeStatus: Upgraded to zesty on 2017-05-01 (64 days ago)

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