minor #465 Add missing use statement for LiveCollectionType (zairigimad)

This PR was squashed before being merged into the 2.x branch.

Discussion
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Add missing use statement for LiveCollectionType

| Q             | A
| ------------- | ---
| Bug fix?      | yes/no
| New feature?  | yes/no <!-- please update src/**/CHANGELOG.md files -->
| Tickets       | Fix #... <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License       | MIT

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Commits
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aee0dea Add missing use statement for LiveCollectionType

src/LiveComponent/src/Resources/doc/index.rst

@@ -1237,6 +1237,7 @@ Now, create a Twig component to render the form::
     use Symfony\UX\LiveComponent\Attribute\AsLiveComponent;
     use Symfony\UX\LiveComponent\DefaultActionTrait;
     use Symfony\UX\LiveComponent\LiveCollectionTrait;
+    use Symfony\UX\LiveComponent\Attribute\LiveProp;
     use App\Entity\BlogPost;
     use App\Form\BlogPostFormType;