Daniel Nephin 9e2302a5ae 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: 6e40868ade
Component: cli

2017-06-02 00:11:03 +00:00

components/cli

Add Dockerfile reference docs for using ARG in FROM

2017-06-02 00:11:03 +00:00

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