Apply suggestions from code review

Co-authored-by: Oskar Stark <oskarstark@googlemail.com>

Author: 0x346e3730

http_client.rst

@@ -139,9 +139,7 @@ You can configure the global options using the ``default_options`` option:
         ]);
 
 You can also use the :method:`Symfony\\Contracts\\HttpClient\\HttpClientInterface::withOptions`
-method to retrieve a new instance of the client with new default options :
-
-    .. code-block:: php
+method to retrieve a new instance of the client with new default options::
 
         $this->client = $client->withOptions([
             'base_uri' => 'https://...',