Document preference of 'internal' package (#24481)

Over `impl` which we also use here and there. We could rename `impl` packages,
but should be careful to check we're not (accidentally?) using them in other modules.
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Arnout Engelen 2018-02-02 12:15:41 +01:00 committed by GitHub
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@ -334,6 +334,9 @@ Note, that `OK TO TEST` will only be picked up when the user asking for it is co
## Source style
Sometimes it is convenient to place 'internal' classes in their own package.
In such situations we prefer 'internal' over 'impl' as a package name.
### Scala style
Akka uses [Scalariform](https://github.com/daniel-trinh/scalariform) to enforce some of the code style rules.