Example: Top level source_url config takes precedence

Author: ftes

mix.exs

@@ -14,7 +14,7 @@ defmodule ExDoc.Mixfile do
       package: package(),
       escript: escript(),
       elixirc_paths: elixirc_paths(Mix.env()),
-      source_url: @source_url,
+      source_url: @source_url <> "BROKEN",
       test_elixirc_options: [docs: true, debug_info: true],
       test_ignore_filters: [&String.starts_with?(&1, "test/fixtures/")],
       name: "ExDoc",