Thomas Riccardi 44c73694c8 Improve build cache miss doc for ARG and RUN ...

The documentation already says the cache miss happens only at `ARG`
variable usage, not declaration, but there is a very common implicit
usage: `RUN`, which this commit documents even more, improving on #21790.

Also, use `definition` instead of `declaration`: it's the same thing, and
`definition` is already used in this documentation, contrary to
`declaration`.

Also, distinguish between "instructions" and "variables defined by `ARG`
instructions".

Signed-off-by: Thomas Riccardi <riccardi@systran.fr>
Upstream-commit: 82f5ef2d2562f9e742eb694dc4b0a1f768a4f0de
Component: engine

2016-04-13 15:02:09 +02:00

components/engine

Improve build cache miss doc for ARG and RUN

2016-04-13 15:02:09 +02:00

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