minor #15195 [HttpFoundation] Remove extra space (sebpacz)

This PR was merged into the 4.4 branch.

Discussion
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[HttpFoundation] Remove extra space

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Commits
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6c72823 [HttpFoundation] Remove extra space

Author: OskarStark

components/http_foundation.rst

@@ -633,7 +633,7 @@ handling, switching to chunked encoding instead::
     use Symfony\Component\HttpFoundation\BinaryFileResponse;
     use Symfony\Component\HttpFoundation\File\Stream;
 
-    $stream  = new Stream('path/to/stream');
+    $stream = new Stream('path/to/stream');
     $response = new BinaryFileResponse($stream);
 
 .. note::