Fix README note about running osm2pgsql multiple times and link to docs for commandline arguments
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@ -194,8 +194,10 @@ size. A whole country might even take one or more hours. You should probably
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not try to import `planet.osm.pbf`.
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You can run the process multiple times, with the same or different area files,
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to import or update the data. You can also truncate the `road` table before
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importing if you want to remove outdated road information.
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to import or update the data. However, for this to work, the actual [command
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line arguments](https://osm2pgsql.org/doc/manual.html#running-osm2pgsql) are a
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bit different each time, including when first importing, and the disk space
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required is much higher.
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Refer to the documentation of `osm2pgsql` for assistance. We are using "flex
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mode", the provided script `api/roads_import.lua` describes the transformations
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