[Doc] Update the "Rails configuration tip" section

Follow up rails/rails#50506.

Author: koic

README.md

@@ -65,7 +65,7 @@ end
 
 ## Rails configuration tip
 
-If you are using Rails 6.1 or newer, add the following `config.generators.after_generate` setting to
+In Rails 6.1+, add the following `config.generators.after_generate` setting to
 your `config/environments/development.rb` to apply RuboCop autocorrection to code generated by `bin/rails g`.
 
 ```ruby
@@ -84,6 +84,20 @@ It uses `rubocop -A` to apply `Style/FrozenStringLiteralComment` and other unsaf
 `rubocop -A` is unsafe autocorrection, but code generated by default is simple and less likely to
 be incompatible with `rubocop -A`. If you have problems you can replace it with `rubocop -a` instead.
 
+In Rails 7.2+, it is recommended to use `config.generators.apply_rubocop_autocorrect_after_generate!` instead of the above setting:
+
+```diff
+ # config/environments/development.rb
+ Rails.application.configure do
+   (snip)
+   # Apply autocorrection by RuboCop to files generated by `bin/rails generate`.
+-  # config.generators.apply_rubocop_autocorrect_after_generate!
++  config.generators.apply_rubocop_autocorrect_after_generate!
+ end
+```
+
+You only need to uncomment.
+
 ## The Cops
 
 All cops are located under