[Bug 234195] diff(1) doesn't document long name for -b

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234195

--- Comment #4 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: bapt
Date: Sat Sep 19 20:15:52 UTC 2020
New revision: 365914
URL: https://svnweb.freebsd.org/changeset/base/365914

Log:
  MFC r361688-r361690, r365041

  r361688:
  Restore compatibility with GNU diff regarding --label

  Various options to "diff(1)" show filenames, and traditionally make use of
the
  "--label" parameter, if set.

  Restore this behaviour in BSD diff.

  While here add a regression test

  PR:  244533
  Submitted by: Jamie Landeg-Jones <jamie at catflap.org>

  r361689:
  diff: restore compatibility with GNU diff regarding -N option

  When -N is used the missing files are treated as empty.

  PR:  233402
  Submitted by: Fehmi Noyan Isi <fnoyanisi at yahoo.com>
  Reported by: Roman Neuhauser <roman at sigpipe.cz>
  Differential Revision: D25081

  r361690:
  Document long version of -b option

  PR:  234195
  Submitted by: Fehmi Noyan Isi <fnoyanisi at yahoo.com>
  Reported by: Andras Farkas <deepbluemistake at gmail.com>

  r365041:
  diff: always properly kill pr(1)

  When diff is invoked with -l it will spawn the pr(1) program.
  In some circumpstances the pr(1) was not properly killed when diff program
  exits.

  Submitted by: Bret Ketchum
  Differential Revision: https://reviews.freebsd.org/D26232

Changes:
_U  stable/12/
  stable/12/usr.bin/diff/diff.1
  stable/12/usr.bin/diff/diff.c
  stable/12/usr.bin/diff/diffreg.c
  stable/12/usr.bin/diff/tests/diff_test.sh

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