Fix docstring of ImageCollection.get
Fix docstring of ImageCollection.get

Signed-off-by: Yusuke Miyazaki <7a2a285b4fbdf4f4cb4311f8c6d5aac808da9aeb@gmail.com>

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