docs(docs): updated documentation for rule

updated documentation for ensure-matching-remove-event-listener rule

Author: AndreaPontrandolfo

docs/rules/ensure-matching-remove-event-listener.md

@@ -4,8 +4,6 @@
 
 💼 This rule is enabled in the following [configs](https://github.com/jsx-eslint/eslint-plugin-react#shareable-configurations): `all`.
 
-💼 This rule is enabled in the following [configs](https://github.com/jsx-eslint/eslint-plugin-react#shareable-configurations): `all`.
-
 When adding "eventListeners" at the mounting phase of a component, sometimes developers forget to remove the "eventListener" in the cleanup function of the useEffect block. This can cause memory leaks in the react application:
 
 > **Console error**: Warning: Can't perform a React state update on an unmounted component. This is a no-op, but it indicates a memory leak in your application. To fix, cancel all subscriptions and asynchronous tasks in a useEffect cleanup function.