minor symfony#13365 Update calls.rst (MaharishiCanada)

This PR was submitted for the 5.0 branch but it was merged into the 4.4 branch instead (closes symfony#13365).

Discussion
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Update calls.rst

Elsewhere in the documentation, the syntax used for the `calls` parameter in services.yaml is `- [method, arguments array]`.

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Commits
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40ad752 Update calls.rst

Author: javiereguiluz

service_container/calls.rst

@@ -40,7 +40,7 @@ To configure the container to call the ``setLogger`` method, use the ``calls`` k
             App\Service\MessageGenerator:
                 # ...
                 calls:
-                    - setLogger: ['@logger']
+                    - [setLogger, ['@logger']]
 
     .. code-block:: xml