Add note about required docker config options
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@ -14,14 +14,16 @@ you may set. A complete reference is shown below.
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### Required
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One of the following settings is required when using the Docker provider:
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* `build_dir` (string) - The path to a directory containing a Dockerfile.
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One of this, `image` or `git_repo` is required.
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* `image` (string) - The image to launch, specified by the image ID or a name
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such as `ubuntu:12.04`. One of this, `git_repo` or `build_dir` is required.
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* `git_repo` (string) - The URL of a git repository to build the image from.
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Supports pulling specific tags, branches and revision, consult the
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Supports pulling specific tags, branches and revision, consult the
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[docker documenation](https://docs.docker.com/engine/reference/commandline/build/#/git-repositories)
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for more information. One of this, `image` or `build_dir` is required.
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