[libvirt] Typo in libvirt python documentation

[Sebastiaan Glazenborg <sebastiaan acore nl>]

There is a tiny typo in the livirt documentation at:
http://libvirt.org/docs/libvirt-appdev-guide-python/en-US/html/libvirt_application_development_guide_using_python-Guest_Domains.html#libvirt_application_development_guide_using_python-Guest_Domains-Domain_Overview

In 'Example 4.2. Fetching a domain object from a name'

domainName = 'someguest'
dom = conn.lookupByName(domainname)

domainname or domainName