docs: Move apollo-datasource-firestore to modern datasources (#7612)

docs/source/data/fetching-data.mdx

@@ -224,12 +224,13 @@ Apollo maintains the following open-source data source for Apollo Server 4:
 | --- | --- | --- |
 | [`RESTDataSource`](https://github.com/apollographql/datasource-rest) | [See Fetching Rest](./fetching-rest)|  HTTP/REST APIs |
 
-The community maintains the following open-source data source for Apollo Server 4:
+The community maintains the following open-source data sources for Apollo Server 4:
 
 <!-- prettier-ignore -->
 | Class | Source | For Use With |
 | --- | --- | --- |
 | [`BatchedSQLDataSource`](https://github.com/nic-jennings/batched-sql-datasource) | Community | SQL databases (via [Knex.js](http://knexjs.org/)) & Batching (via [DataLoader](https://github.com/graphql/dataloader)) |
+| [`FirestoreDataSource`](https://github.com/swantzter/apollo-datasource-firestore) | Community | Cloud Firestore |
 
 ### Legacy data source classes
 
@@ -246,7 +247,6 @@ The larger community maintains the following open-source implementations:
 | [`SQLDataSource`](https://github.com/cvburgess/SQLDataSource) | Community | SQL databases (via [Knex.js](http://knexjs.org/)) |
 | [`MongoDataSource`](https://github.com/GraphQLGuide/apollo-datasource-mongodb/) | Community | MongoDB |
 | [`CosmosDataSource`](https://github.com/andrejpk/apollo-datasource-cosmosdb) | Community | Azure Cosmos DB |
-| [`FirestoreDataSource`](https://github.com/swantzter/apollo-datasource-firestore) | Community | Cloud Firestore |
 
 > Apollo does not provide official support for community-maintained libraries. We cannot guarantee that community-maintained libraries adhere to best practices, or that they will continue to be maintained.