docs: create multiple pathways to find ARG and FROM info#1
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docs: create multiple pathways to find ARG and FROM info#1
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looking up `ARG` in the reference misses all mention of several important facts: - `ARG` values are reset with each `FROM` - reset `ARG`s can be brought back into scope with an empty declaration - `ARG`s may be used in `FROM` statements these facts are well documented under `FROM` ([see _Understand how ARG and FROM interact_](https://docs.docker.com/engine/reference/builder/#understand-how-arg-and-from-interact)), so this change tries to help the reader find that documentation when starting at `ARG` or **Format**.
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