Use feature in experimental-features code sample

Author: ellnix

.code-samples.meilisearch.yaml

@@ -1650,7 +1650,7 @@ get_experimental_features_1: |-
 update_experimental_features_1: |-
   let client = Client::new("http://localhost:7700", Some("apiKey"));
   let features = ExperimentalFeatures::new(&client);
-  // update the feature you want here
+  features.set_metrics(true)
   let res = features
     .update()
     .await