Merge pull request rails#52349 from rails/fxn/before_configuration

Improve the docs of before_configuration

Author: fxn

guides/source/configuring.md

@@ -3752,7 +3752,7 @@ Initialization Events
 
 Rails has 5 initialization events which can be hooked into (listed in the order that they are run):
 
-* `before_configuration`: This is run as soon as the application constant inherits from `Rails::Application`. The `config` calls are evaluated before this happens.
+* `before_configuration`: This is run when the application class inherits from `Rails::Application` in `config/application.rb`. Before the class body is executed. Engines may use this hook to run code before the application itself gets configured.
 
 * `before_initialize`: This is run directly before the initialization process of the application occurs with the `:bootstrap_hook` initializer near the beginning of the Rails initialization process.