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fixed upstream by:

commit 34a19e497e072fe45378799af96eeb7e79c738b4
Author: Cole Robinson <crobinso>
Date:   Sun May 10 18:10:21 2015 -0400

    man: virt-xml: Fix example

I can reproduce this bug on the following version:
virt-manager-1.1.0-12.el7.noarch
virt-install-1.1.0-12.el7.noarch

Steps are the same as the backport in Comment 1 shows.

Then verify with the latest package:
virt-manager-1.2.0-4.el7.noarch
virt-install-1.2.0-4.el7.noarch

Steps:
1. #man virt-xml

2. Search the following part: "virt-xml fedora19 --add-device"

Results:
There is message like this in the manual page:
'virt-xml fedora19 --add-device --hostdev 001.003 --update'

As the result indicates by using the latest virt-manager package, move this bug from ON_QA to VERIFIED.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2206.html