Update the primary key examples

Author: brunoocasali

.code-samples.meilisearch.yaml

@@ -8,7 +8,9 @@ get_one_index_1: |-
 list_all_indexes_1: |-
   client.indexes
 create_an_index_1: |-
-  client.create_index('movies', primary_key: 'movie_id')
+  client.create_index('movies')
+document_guide_create_index_primary_key: |-
+  client.create_index('movies', primary_key: 'reference_number')
 update_an_index_1: |-
   client.index('movies').update(primary_key: 'movie_id')
 delete_an_index_1: |-
@@ -17,6 +19,16 @@ get_one_document_1: |-
   client.index('movies').document(25684)
 get_documents_1: |-
   client.index('movies').documents(limit: 2)
+document_guide_add_document_primary_key: |-
+  client.index('movies', primary_key: 'reference_number').add_documents([
+    {
+      reference_number: 287947,
+      title: 'Shazam',
+      poster: 'https://image.tmdb.org/t/p/w1280/xnopI5Xtky18MPhK40cZAGAOVeV.jpg',
+      overview: 'A boy is given the ability to become an adult superhero in times of need with a single magic word.',
+      release_date: '2019-03-23'
+    }
+  ])
 add_or_replace_documents_1: |-
   client.index('movies').add_documents([
     {