   Will have a final value for `Repo` of:
 
       [log_level: :info, pool_size: 10]
+
+  This final value can be retrieved at run or compile time:
+
+      Application.get_env(:ecto, Repo)
 
   """
   defmacro config(app, key, opts) do

  Furthermore, this module provides functions like `read!/1`,
  `merge/2` and friends which help manipulate configurations
  in general.
  """

  defmodule LoadError do


      [log_level: :info, mode: :truncate, threshold: 1024]


  This final configuration can be retrieved at run or compile time:

      Application.get_all_env(:lager)

  """
  defmacro config(app, opts) do
    quote do
