Merge #1321

1321: Fix code sample from the getting started r=bidoubiwa a=bidoubiwa

Index should be `movies` but was `movie`.

Co-authored-by: Charlotte Vermandel <[email protected]>
Co-authored-by: cvermand <[email protected]>

Author: meili-bors[bot]

.code-samples.meilisearch.yaml

@@ -415,7 +415,7 @@ getting_started_add_documents_md: |-
   **Use**
   ```js
   const client = new MeiliSearch({ host: 'http://localhost:7700' })
-  client.index('movie').addDocuments(movies)
+  client.index('movies').addDocuments(movies)
     .then((res) => console.log(res))
   ```