fixup! Clarify breaking changes summary

docs/modules/ROOT/pages/upgrade_to_version_2.adoc

@@ -10,7 +10,7 @@ In version 2.x:
  - cop departments are nested for cops with a department that doesn’t match the extension name (`Capybara`, `FactoryBot`, `Rails`)
  - `AllCops/RSpec/Patterns`/`AllCops/FactoryBot/Patterns` options are removed
  - Calling `super` from `#on_new_investigation` defined in a cop is mandatory now
- - Avoid explicit definition of `cop` as `described_class.new`
+ - In specs, do not define `cop`
 
 [discrete]
 === Adjust the configuration of `RSpec/EmptyExampleGroup`