Fix typo in old Doctrine Annotation syntax (#787)

The text was displaying the Attribute syntax instead of the Doctrine Annotation syntax.

Author: cvergne

website/versioned_docs/version-8.0.0/queries.mdx

@@ -44,7 +44,7 @@ As you can see, GraphQLite will automatically do the mapping between PHP types a
 
 GraphQLite relies a lot on attributes.
 
-It supports the new PHP 8 attributes (`#[Query]`), the "Doctrine annotations" style (`#[Query]`) was dropped.
+It supports the new PHP 8 attributes (`#[Query]`), the "Doctrine annotations" style (`@Query`) was dropped.
 
 ## Testing the query