fix: add language part in link to Jest tutorial

Joppe Geluykens · web-flow · commit 174d7890ed91 · 2017-10-12T10:43:50.000+02:00
Link to Jest tutorial led to 404 since it didn't include the `/en/` language part.
diff --git a/content/docs/addons-test-utils.md b/content/docs/addons-test-utils.md
@@ -15,7 +15,7 @@ var ReactTestUtils = require('react-dom/test-utils'); // ES5 with npm
 
 ## Overview
 
-`ReactTestUtils` makes it easy to test React components in the testing framework of your choice. At Facebook we use [Jest](https://facebook.github.io/jest/) for painless JavaScript testing. Learn how to get started with Jest through the Jest website's [React Tutorial](http://facebook.github.io/jest/docs/tutorial-react.html#content).
+`ReactTestUtils` makes it easy to test React components in the testing framework of your choice. At Facebook we use [Jest](https://facebook.github.io/jest/) for painless JavaScript testing. Learn how to get started with Jest through the Jest website's [React Tutorial](http://facebook.github.io/jest/docs/en/tutorial-react.html#content).
 
 > Note:
 >

Original file line number	Diff line number	Diff line change
`@@ -15,7 +15,7 @@ var ReactTestUtils = require('react-dom/test-utils'); // ES5 with npm`
`15`	`15`
`16`	`16`	`## Overview`
`17`	`17`
`18`		-`ReactTestUtils` makes it easy to test React components in the testing framework of your choice. At Facebook we use [Jest](https://facebook.github.io/jest/) for painless JavaScript testing. Learn how to get started with Jest through the Jest website's [React Tutorial](http://facebook.github.io/jest/docs/tutorial-react.html#content).
	`18`	+`ReactTestUtils` makes it easy to test React components in the testing framework of your choice. At Facebook we use [Jest](https://facebook.github.io/jest/) for painless JavaScript testing. Learn how to get started with Jest through the Jest website's [React Tutorial](http://facebook.github.io/jest/docs/en/tutorial-react.html#content).
`19`	`19`
`20`	`20`	`> Note:`
`21`	`21`	`>`