Add update_embedders_1 code sample (#722)

Author: Strift

.code-samples.meilisearch.yaml

@@ -791,3 +791,12 @@ get_all_batches_1: |-
   $client->getBatches();
 get_batch_1: |-
   $client->getBatch(BATCH_UID);
+update_embedders_1: |-
+  $client->updateEmbedders([
+    'default' => [
+      'source' => 'openAi',
+      'apiKey' => 'OPEN_AI_API_KEY',
+      'model' => 'text-embedding-3-small',
+      'documentTemplate' => 'A document titled '{{doc.title}}' whose description starts with {{doc.overview|truncatewords: 20}}'
+    ]
+  ]);