minor #1182 [Agent][SimilaritySearch] Fix class reference in documentation (Ippey)

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

Discussion
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[Agent][SimilaritySearch] Fix class reference in documentation

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Docs?         | yes <!-- required for new features -->
| Issues        |
| License       | MIT

Fixed `SimilaritySearch` class reference and link.

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Commits
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a8b6404 [Agent][SimilaritySearch] Fix class reference in documentation

Author: OskarStark

docs/components/agent.rst

@@ -452,11 +452,11 @@ Retrieval Augmented Generation (RAG)
 In combination with the `Store Component`_, the Agent component can be used to build agents that perform Retrieval
 Augmented Generation (RAG). This allows the agent to retrieve relevant documents from a store and use them to generate
 more accurate and context-aware results. Therefore, the component provides a built-in tool called
-:class:`Symfony\\AI\\Agent\\Toolbox\\Tool\\SimilaritySearch`::
+:class:`Symfony\\AI\\Agent\\Bridge\\SimilaritySearch\\SimilaritySearch`::
 
     use Symfony\AI\Agent\Agent;
+    use Symfony\AI\Agent\Bridge\SimilaritySearch\SimilaritySearch;
     use Symfony\AI\Agent\Toolbox\AgentProcessor;
-    use Symfony\AI\Agent\Toolbox\Tool\SimilaritySearch;
     use Symfony\AI\Agent\Toolbox\Toolbox;
     use Symfony\AI\Platform\Message\Message;
     use Symfony\AI\Platform\Message\MessageBag;