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

[Paul Norman]

> @@ -0,0 +1,16 @@
> +    [
> +      {
> +        "name": "building",
> +        "type": "polygon",
> +        "tagtransform": "building.lua",
> +	"tagtransform-node-function": "nodes_proc",

missing space, as with the multi docs

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https://github.com/openstreetmap/osm2pgsql/pull/226/files#r21409618
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