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

[Paul Norman]

docs/multi.md states
> As with the normal top level options within osm2pgsql you can specify any of the following: tablespace-index, tablespace-data, enable-hstore, enable-hstore-index, enable-multi, hstore-match-only. Hstore colum names may be specified via an array of strings named hstores. 

It doesn't specify how - adding `    "hstore-match-only": true` to the json didn't work

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