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Make it clear that JSON array format should be used if CMD is used as default arguments

Signed-off-by: Xuecong Liao <satorulogic@gmail.com>

satoru authored on 2014/08/07 15:39:14
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@@ -196,6 +196,11 @@ container.** These defaults can include an executable, or they can omit
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 the executable, in which case you must specify an `ENTRYPOINT`
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 instruction as well.
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+> **Note**:
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+> If `CMD` is used to provide default arguments for the `ENTRYPOINT` 
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+> instruction, both the `CMD` and `ENTRYPOINT` instructions should be specified 
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+> with the JSON array format.
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+
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 When used in the shell or exec formats, the `CMD` instruction sets the command
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 to be executed when running the image.
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