[Tile-serving] [osm2pgsql] Add documentation and improve legibility style.lua (#345)

[math1985]

>     keyvalues, roads = add_z_order(keyvalues)
>  
> -   return filter, keyvalues, membersuperseeded, boundary, polygon, roads
> +   return filter, keyvalues, membersuperseded, boundary, polygon, roads

Thanks, fixed.

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