Fix typo and Markdown

Author: alallema

.code-samples.meilisearch.yaml

@@ -332,7 +332,9 @@ documents_guide_add_movie_1: |-
     'title': 'Amélie Poulain'
   }])
 getting_started_check_task_status_md: |-
+  ```python
   client.index('movies').get_task(0)
+  ```
 getting_started_add_documents_md: |-
   ```bash
   pip3 install meilisearch
@@ -360,7 +362,7 @@ getting_started_add_meteorites: |-
   import json
 
   json_file = open('meteorites.json')
-  movies = json.load(json_file)
+  meteorites = json.load(json_file)
   client.index('meteorites').add_documents(meteorites)
 getting_started_update_rankingRules: |-
   client.index('movies').update_ranking_rules([