Clarify load_environment_config initializer order [ci-skip]

The description of `load_environment_hook` does mention that
`load_environment_config` runs before it, but that description is at the
distant top of the list.  This commit makes it clear that
`load_environment_config` runs before `load_environment_hook` without
having to read the list from top to bottom.

Author: jonathanhefner

guides/source/configuring.md

@@ -3162,7 +3162,7 @@ Below is a comprehensive list of all the initializers found in Rails in the orde
 
 * `add_mailer_preview_paths`: Adds the directory `test/mailers/previews` from the application, railties, and engines to the lookup path for mailer preview files for the application.
 
-* `load_environment_config`: Loads the `config/environments` file for the current environment.
+* `load_environment_config`: This initializer runs before `load_environment_hook`. Loads the `config/environments` file for the current environment.
 
 * `prepend_helpers_path`: Adds the directory `app/helpers` from the application, railties, and engines to the lookup path for helpers for the application.