[Tile-serving] [openstreetmap/osm2pgsql] Lua helper functions availablity (#1202)

[Sarah Hoffmann]

@lonvia commented on this pull request.



> @@ -1,6 +1,8 @@
 
 # Lua Helper Library
 
+Note: All functions described in this section are available on the [`flex`](flex.md) backend only. They cannot be used in [Lua tag transformations](lua.md).

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