Fix domainname documentation in create_container function
Fix domainname documentation in create_container function

It looks like this was probably originally copypasta'ed from dns_search
and not edited afterward.

Signed-off-by: Erik Johnson <43d4bedced1af4597739798c38c6ae5eac3c296e@gmail.com>

vdemeester/docker-py,docker/docker-py,vpetersson/docker-py,youhong316/docker-py,vpetersson/docker-py,funkyfuture/docker-py,youhong316/docker-py,vdemeester/docker-py,docker/docker-py,funkyfuture/docker-py