Merge #1529

1529: Update getting_started code-samples r=bidoubiwa a=meili-bot

_This PR is auto-generated._
Update the code-samples.meilisearch.yml according to the [documentation issue](meilisearch/documentation#2499). 
The `api_key` field is missing in the instantiation of the client in the getting started samples.
Add `aSampleMasterKey` as the `api_key`.
cURL example:
```bash
    curl \
  -X POST 'http://localhost:7700/indexes/movies/documents?primaryKey=id' \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer aSampleMasterKey' \
  --data-binary `@movies.json`
````


Co-authored-by: meili-bot <[email protected]>

Author: meili-bors[bot]

.code-samples.meilisearch.yaml

@@ -439,7 +439,10 @@ getting_started_add_documents_md: |-
 
   **Use**
   ```js
-  const client = new MeiliSearch({ host: 'http://localhost:7700' })
+  const client = new MeiliSearch({
+    host: 'http://localhost:7700',
+    apiKey: 'aSampleMasterKey'
+  })
   client.index('movies').addDocuments(movies)
     .then((res) => console.log(res))
   ```