Update Ecto.Multi.run example

[darksheik]

My jobs did not run initially after upgrading to the latest release, as it seems the new spec of Ecto.Multi.run is now that the 3rd arg now is a function with arity 2. (current Ecto is 3.1.4)

Updating example in ecto_job doc to reflect that change.

From Ecto.Multi:

[Ecto.Multi] Ecto.Multi.run/3 now receives the repo in which the transaction is executing as the first argument to functions, and the changes so far as the second argument

Code:

  @doc """
  Adds a function to run as part of the multi.

  The function should return either `{:ok, value}` or `{:error, value}`,
  and receives the repo as the first argument, and the changes so far
  as the second argument.

  ## Example

      Ecto.Multi.run(multi, :write, fn _repo, %{image: image} ->
        with :ok <- File.write(image.name, image.contents) do
          {:ok, nil}
        end
      end)
  """
  @spec run(t, name, run) :: t
  def run(multi, name, run) when is_function(run, 2) do
    add_operation(multi, name, {:run, run})
  end

[mbuhot]

Thanks @darksheik @VitorTrin 👍