[Tile-serving] [openstreetmap/osm2pgsql] Mention multi example in docs (#263)

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[![Coverage Status](https://coveralls.io/builds/7495071/badge)](https://coveralls.io/builds/7495071)

Changes Unknown when pulling **a6c0ebe50f75e7b982cd102b10c571e103139b29 on pnorman:multi_docs2** into ** on openstreetmap:master**.


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