[Tile-serving] [osm2pgsql] Use the polygon flag from the tagtransforms to change multi-backend (#471)

[Sarah Hoffmann]

>  may be specified via an array of strings named `hstores`. Finally standard columns
>  may be specified via an array of objects named `tags` with each object containing
>  a `name` and a postgres `type`. Note you may also set `flags` on each tag as with
>  the standard osm2pgsql style file. `flags` is formated exactly as in the style file
> -as a string of flag names seprated by commas.
> +as a string of flag names separated by commas.
> +
> +## Polygons ##
> +
> +Area handling differs slightly from the traditional osm2pgsql C and Lua transforms
> +where if a way is added to the polygon or line table depends on if it is closed,
> +not just its tagging. All tables with the multi-backend are independent.
> +
> +All ways in `line` tables are turned into linestrings and what the tag
> +transform sets the polygon flag to does not matter.. In `polygon` tables ways

Remove duplicate full stop.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/471/files#r43045195
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