updated package name for svelte

docs/svelte-testing-library/intro.md

@@ -7,7 +7,7 @@ title: Svelte Testing Library
 [Svelte](https://svelte.dev/) components & applications.
 
 ```
-npm install --save-dev svlt-testing-library
+npm install --save-dev svelte-testing-library
 ```
 
 - [svelte-testing-library on GitHub][gh]
@@ -21,7 +21,7 @@ order to use svelte in jest.
 You must add `cleanup` to your test fixture's `beforeEach` hook:
 
 ```javascript
-import { render, cleanup } from 'svlt-testing-library'
+import { render, cleanup } from 'svelte-testing-library'
 
 beforeEach(cleanup) //this is required.
 ```
@@ -48,7 +48,7 @@ App.spec.js
 
 ```javascript
 import App from '../src/App.svelte'
-import { render, cleanup } from 'svlt-testing-library'
+import { render, cleanup } from 'svelte-testing-library'
 beforeEach(cleanup)
 describe('App', () => {
   test('should render greeting', () => {
@@ -69,4 +69,24 @@ describe('App', () => {
 })
 ```
 
+### Cleanup
+
+You can ensure [`cleanup`](./api#cleanup) is called after each test and import
+additional assertions by adding it to the setup configuration in Jest.
+
+In Jest 24 and up, add the
+[`setupFilesAfterEnv`](https://jestjs.io/docs/en/configuration.html#setupfilesafterenv-array)
+option to your Jest config:
+
+```javascript
+// jest.config.js
+module.exports = {
+  setupFilesAfterEnv: [
+    'svelte-testing-library/cleanup-after-each',
+    // ... other setup files ...
+  ],
+  // ... other options ...
+}
+```
+
 [gh]: https://github.com/testing-library/svelte-testing-library