minor symfony#52147 [HttpKernel] Improve PHPDoc on #[AsController] attribute (muchafm)

This PR was squashed before being merged into the 6.4 branch.

Discussion
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[HttpKernel] Improve PHPDoc on `#[AsController]` attribute

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | Fix symfony#51920
| License       | MIT

Improve PHPDoc on AsController attribute

Commits
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d5c59e0 [HttpKernel] Improve PHPDoc on `#[AsController]` attribute

Author: nicolas-grekas

src/Symfony/Component/HttpKernel/Attribute/AsController.php

@@ -12,7 +12,11 @@
 namespace Symfony\Component\HttpKernel\Attribute;
 
 /**
- * Service tag to autoconfigure controllers.
+ * Autoconfigures controllers as services by applying
+ * the `controller.service_arguments` tag to them.
+ *
+ * This enables injecting services as method arguments in addition
+ * to other conventional dependency injection strategies.
  */
 #[\Attribute(\Attribute::TARGET_CLASS)]
 class AsController