Daniel Nephin 0e1fc8025c Add Dockerfile reference docs for using ARG in FROM
Also fixed some examples of using `docker build` to clarify that the
positional argument is a directory, not a file.

Also fixed some terminology. Dockerfiles contain instructions, not directives or
commands.

Signed-off-by: Daniel Nephin <dnephin@docker.com>
Upstream-commit: 3437715e20b3a1b16ea93a47802794b58b007863
Component: engine
2017-04-11 11:34:43 -04:00
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