Fix grammar (#4502)

* Fix grammar

* Update rendering-lists.md

Co-authored-by: dan <dan.abramov@gmail.com>

beta/src/pages/learn/rendering-lists.md

@@ -30,7 +30,7 @@ Say that you have a list of content.
 </ul>
 ```
 
-The only difference among those list items are their contents, their data. You will run into many situations where you need many of the same component using different data when building interfaces: from lists of comments to galleries of profile images. In these situations, you can store that data in JavaScript objects and arrays and use methods like [`map()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map) and [`filter()`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/filter) to render lists of components from them.
+The only difference among those list items is their contents, their data. You will often need to show several instances of the same component using different data when building interfaces: from lists of comments to galleries of profile images. In these situations, you can store that data in JavaScript objects and arrays and use methods like [`map()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map) and [`filter()`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/filter) to render lists of components from them.
 
 Here’s a short example of how to generate a list of items from an array: