minor #11891 [Testing] Fixed a minor formatting issue (javiereguiluz)

This PR was merged into the 4.2 branch.

Discussion
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[Testing] Fixed a minor formatting issue

Fixes this:

![image](https://user-images.githubusercontent.com/73419/60683158-9e527d80-9e96-11e9-8d3e-618465693e77.png)

Commits
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248802b [Testing] Fixed a minor formatting issue

Author: javiereguiluz

testing.rst

@@ -699,7 +699,7 @@ given text (or the first clickable image with that ``alt`` attribute)::
 
 If you need access to the :class:`Symfony\\Component\\DomCrawler\\Link` object
 that provides helpful methods specific to links (such as ``getMethod()`` and
-``getUri()``), use the ``selectLink()`` method instead:
+``getUri()``), use the ``selectLink()`` method instead::
 
     $client = static::createClient();
     $crawler = $client->request('GET', '/post/hello-world');