Joao Fernandes a0c49cf7f4 Clean docker run -e reference docs
Simplified the docs on how to set environment variables in a
container. Makes it clear that you have three options, and how
to use them.

Signed-off-by: Joao Fernandes <joao.fernandes@docker.com>
Upstream-commit: 66cfdff646
Component: cli
2017-06-02 00:11:03 +00:00
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