[Tile-serving] [openstreetmap/osm2pgsql] Doc fixes (#974)

[mmd]

mmd-osm commented on this pull request.



>  the flat\-nodes mode. This can also increase the speed of applying diff files. This option
 activates the flat\-nodes mode and specifies the location of the database file. It is a
-single large > 16GB file. This mode is only recommended for full planet imports
+single large > 43GB file. This mode is only recommended for full planet imports

Can we add some description how this is calculated to avoid updating the docs every few months? Maybe "largest node id * 8 bytes". People adding their own fake node ids with higher offsets to their database also need to be aware of flat file space requirements here.

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