Merge #490

490: 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

@@ -1057,7 +1057,7 @@ getting_started_add_documents_md: |-
   use futures::executor::block_on;
 
   fn main() { block_on(async move {
-    let client = Client::new("http://localhost:7700", Some("masterKey"));
+    let client = Client::new("http://localhost:7700", Some("aSampleMasterKey"));
 
     // reading and parsing the file
     let mut file = File::open("movies.json")