Update documents code-sample for v0.28.0 (#1292)

Author: bidoubiwa

.code-samples.meilisearch.yaml

@@ -13,8 +13,10 @@ update_an_index_1: |-
   client.updateIndex('movies', { primaryKey: 'id' })
 delete_an_index_1: |-
   client.deleteIndex('movies')
-PLEASE_UPDATE_ME>>>>>>>>>>>>>get_one_document_1: |-
-  client.index('movies').getDocument(25684)
+get_one_document_1: |-
+  client
+      .index('movies')
+      .getDocument(25684, { fields: ['id', 'title', 'poster', 'release_date'] })
 get_documents_1: |-
   client.index('movies').getDocuments({ limit: 2 })
 add_or_replace_documents_1: |-