[Bug 199472] Add extra hints to ftruncate.2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199472

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A commit references this bug:

Author: jhb
Date: Tue Jun  2 15:12:35 UTC 2015
New revision: 283916
URL: https://svnweb.freebsd.org/changeset/base/283916

Log:
  MFC 282417:
  Various updates to the ftruncate(2) documentation:
  - Note that ftruncate(2) can operate on shared memory objects and cross
    reference shm_open(2).
  - Note that ftruncate(2) does not change the file position pointer (aka
    seek pointer) of the file descriptor.
  - ftruncate(2) will fail with EINVAL for all sorts of other fd types than
    just sockets, so instead note that it fails for all but regular files and
    shared memory objects.
  - Note that ftruncate(2) also appeared in 4.2BSD along with truncate(2).
    (Or at least the manpage for both appeared in 4.2, I did not check the
    kernel code itself to see if either predated 4.2.)

  PR:        199472

Changes:
_U  stable/10/
  stable/10/lib/libc/sys/truncate.2
_U  stable/8/lib/libc/
_U  stable/8/lib/libc/sys/
  stable/8/lib/libc/sys/truncate.2
_U  stable/9/lib/libc/
_U  stable/9/lib/libc/sys/
  stable/9/lib/libc/sys/truncate.2

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