minor #10625 Update autowiring.rst (DonCallisto, jmsche)

This PR was merged into the 4.1 branch.

Discussion
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Update autowiring.rst

ref.: symfony/symfony#29028

Commits
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42d8fb1 review fix
88faadd Update service_container/autowiring.rst
f325679 Update service_container/autowiring.rst
6ea7f5e Update autowiring.rst
7b85a18 Update autowiring.rst

Author: javiereguiluz

service_container/autowiring.rst

@@ -341,6 +341,12 @@ Thanks to the ``App\Util\TransformerInterface`` alias, the autowiring subsystem
 knows that the ``App\Util\Rot13Transformer`` service should be injected when
 dealing with the ``TransformerInterface``.
 
+.. tip::
+
+    As long as there is only one class implementing the interface and that class
+    is part of the same namespace configuring the alias is not mandatory and Symfony
+    will automatically create one.
+
 Dealing with Multiple Implementations of the Same Type
 ------------------------------------------------------