[Store] Remove duplicate class comment from Indexer

The comment was already present on IndexerInterface and duplicated on the implementation class.

Author: OskarStark

src/store/src/Indexer.php

@@ -17,8 +17,6 @@
 use Symfony\AI\Store\Document\VectorizerInterface;
 
 /**
- * Converts a collection of TextDocuments into VectorDocuments and pushes them to a store implementation.
- *
  * @author Christopher Hertel <[email protected]>
  */
 final readonly class Indexer implements IndexerInterface