[docs] Distribute/Snapcraft.mdx: on snapcraft.yaml

[J1-takai]

Note for Update (Noted during JA translation)

In "## Configuration - ### Explanation" section;

There are three items in the explanation section - the last three item from override-pull to organize - which are not mentioned in the snapcraft.yaml file example. I wonder if these items are still valid in the current or newer version ...

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