[Tile-serving] [osm2pgsql] Added link to explanation of web mercator and removed typo in shell comm... (#63)

[Marcos Dione]

Besides the path to the actual file, the fix in the command to execute is good. I was just bitten by it.

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https://github.com/openstreetmap/osm2pgsql/pull/63#issuecomment-29111750
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