Merge branch 'master' of https://github.com/reactjs/reactjs.org into sync-d2d2ee42

Author: reactjs-translation-bot

content/docs/faq-functions.md

@@ -83,7 +83,7 @@ class Foo extends Component {
 
 >**Note:**
 >
->Using an arrow function in render creates a new function each time the component renders, which may have performance implications (see below).
+>Using an arrow function in render creates a new function each time the component renders, which may break optimizations based on strict identity comparison.
 
 ### Is it OK to use arrow functions in render methods? {#is-it-ok-to-use-arrow-functions-in-render-methods}
 

content/docs/hooks-reference.md

@@ -226,7 +226,7 @@ function reducer(state, action) {
   }
 }
 
-function Counter({initialState}) {
+function Counter() {
   const [state, dispatch] = useReducer(reducer, initialState);
   return (
     <>