[Tagging] Clarification unclassified vs residential

[Tomas Straupis]

I would agree with those stating importance of road network hierarchy and
connectivity (for both routing and cartography).
Having unclassified as higher than residential but lower than tertiary
helps a lot.

Maybe google will translate this old post with some practical examples and
some technical connectivity checking info:

https://blog.openmap.lt/2017/12/09/keliu-hierarchija/
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