fix: add commas (#870)

Author: Mosaab-Emam

_includes/parse-server/getting-started.md

@@ -92,7 +92,7 @@ $ curl -X GET \
 
 ```
 
-To learn more about using saving and querying objects on Parse Server, check out the [documentation]({{ site.baseUrl }}/) for the SDK you will be using in your app.
+To learn more about using, saving, and querying objects on Parse Server, check out the [documentation]({{ site.baseUrl }}/) for the SDK you will be using in your app.
 
 ## Connect your app to Parse Server