minor #16742 [Doctrine] Fix fetch method (yourwebmaker)

This PR was submitted for the 6.0 branch but it was merged into the 4.4 branch instead.

Discussion
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[Doctrine] Fix fetch method

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Commits
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74e6174 Fix fetch method

Author: javiereguiluz

doctrine/dbal.rst

@@ -55,7 +55,7 @@ object::
     {
         public function index(Connection $connection): Response
         {
-            $users = $connection->fetchAll('SELECT * FROM users');
+            $users = $connection->fetchAllAssociative('SELECT * FROM users');
 
             // ...
         }