[Tile-serving] [osm2pgsql] Add Multi Backend Docs and Sample Configuration (#226)

[Paul Norman]

> +
> +## Database Layout ##
> +It connects to a PostgreSQL database and stores the data in one or more tables.
> +Each table is configured in a way similar to that of the `pgsql` backend.
> +That is essentially why it was named `multi` because it's basically multiple
> +`pgsql` backends each with its own set of options and only a single table.
> +
> +## Table Configuration ##
> +As sample configuration may resemble the following:
> +
> +    [
> +      {
> +        "name": "building",
> +        "type": "polygon",
> +        "tagtransform": "building.lua",
> +	"tagtransform-node-function": "nodes_proc",

there appears to be a space missing here compared to the line above

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