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Description of problem:
the information about 'snapshot' attribute is not coincident between libvirt.org and actual feature 

Version-Release number of selected component (if applicable):
libvirt-3.9.0-5.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Set the value of 'snapshot' attribute as 'yes'. Edit the guest xml as:
 <disk type='file' device='disk' ***snapshot='yes'***>
      <driver name='qemu' type='qcow2'/>
      <source file='/var/lib/libvirt/images/b.qcow2'/>
      <target dev='sda' bus='scsi'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>

can't save the xml,the error is:
error: unsupported configuration: unknown disk snapshot setting 'yes'

2.in the libvirt.org,it said:
"for example, snapshot='yes' with a transient disk generally does not make sense"

from this sentence,I think 'snapshot' supports the value 'yes'

Actual results:
the information in step1 and step2 is not coincident
Maybe the libvirt.org has inaccurate information

Expected results:


Additional info:

Fixed upstream:

commit 1e98d450f27ae0131ac2ac8aa1c1d7a254d22dd1 
Author: Peter Krempa <pkrempa>
Date:   Thu Dec 7 14:16:10 2017 +0100

    docs: domain: Fix documentation of the 'snapshot' attribute for <disk>
    
    Emphasise the valid values by wrapping them in <code> and reword the
    last sentence so that the invalid value example can be dropped.

version:
libvirt-3.9.0-7.el7.x86_64

verify the bug,there is no value 'yes' in the doc

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://access.redhat.com/errata/RHEA-2018:0704