 
   The given `opts` are merged into the existing values for `key`
   in the given `app`. Conflicting keys are overridden by the
-  ones specified in `opts`. For example, given the two configurations
-  below:
+  ones specified in `opts`. For example, the application
+  configuration below
 
       config :ecto, Repo,
         log_level: :warn,


      use Mix.Config

      config :some_app,
        key1: "value1",
        key2: "value2"


        log_level: :info,
        pool_size: 10

  will have a final value of the configuration for the `Repo`
  key in the `:ecto` application of:

      [log_level: :info, pool_size: 10, adapter: Ecto.Adapters.Postgres]

  """
  def config(app, key, opts) when is_atom(app) do
