Fixed some typos and other grammatical errors.

"Docker-DCO-1.1-Signed-off-by: William Henry whenry@redhat.com (github: ipbabble)"

File changed
	modified:   docker-attach.1
	modified:   docker-build.1
	modified:   docker-images.1
	modified:   docker-info.1
	modified:   docker-run.1
	modified:   docker-tag.1
	modified:   docker.1