minor #17380 [Doctrine/Events] Fix bad argument name in example (neghmurken)

This PR was submitted for the 6.1 branch but it was merged into the 5.4 branch instead.

Discussion
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[Doctrine/Events] Fix bad argument name in example

The ContainerConfigurator variable name used in method argument did not match the name used in the method body

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Commits
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bdb7399 [Doctrine/Events] Fix bad argument name in example

Author: OskarStark

doctrine/events.rst

@@ -227,7 +227,7 @@ with the ``doctrine.event_listener`` tag:
 
         use App\EventListener\SearchIndexer;
 
-        return static function (ContainerConfigurator $container) {
+        return static function (ContainerConfigurator $configurator) {
             $services = $configurator->services();
 
             // listeners are applied by default to all Doctrine connections