Update symfony-client.rst (#273)

Fixed use statement
php-http · Nov 15, 2019 · 48ff8af · 48ff8af
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commit 48ff8af
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diff --git a/clients/symfony-client.rst b/clients/symfony-client.rst
@@ -23,6 +23,7 @@ to install one as well. `Nyholm PSR-7`_ is supported natively:
 
 Usage
 -----
+.. code-block:: php
 
     use Symfony\Component\HttpClient\HttplugClient;