minor #16569 docs : update autowiring.rst (bsureau)

This PR was merged into the 4.4 branch.

Discussion
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docs : update autowiring.rst

Add missing `arguments` key in `services.yaml` code block example - [#dealing-with-multiple-implementations-of-the-same-type](https://symfony.com/doc/4.4/service_container/autowiring.html#dealing-with-multiple-implementations-of-the-same-type) section.

Commits
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b4eeb3b docs : update autowiring.rst

Author: javiereguiluz

service_container/autowiring.rst

@@ -464,6 +464,7 @@ the injection::
 
                 # If you wanted to choose the non-default service and do not
                 # want to use a named autowiring alias, wire it manually:
+                # arguments:
                 #     $transformer: '@App\Util\UppercaseTransformer'
                 # ...