[Tile-serving] [osm2pgsql] Document new multi and top level options (#266)

[Paul Norman]

I ended up removing `"hstores"` and any other hstore options from the JSON and passing `--hstore`/`-k` on the command line, but there should be a better way

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/266#issuecomment-71518028
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