fix: tutorial link in package readme

Author: sachaarbonel

packages/stream_feed/README.md

@@ -7,7 +7,7 @@
 **🔗 Quick Links**
 
 - [Register](https://getstream.io/activity-feeds/try-for-free) to get an API key for Stream Activity Feeds
-- [Tutorial](https://getstream.io/activity-feed/sdk/flutter/tutorial/) to learn how to setup a timeline feed, follow other feeds and post new activities.
+- [Tutorial](https://getstream.io/activity-feeds/sdk/flutter/tutorial/) to learn how to setup a timeline feed, follow other feeds and post new activities.
 - [Stream Activity Feeds UI Kit](https://getstream.io/activity-feeds/ui-kit/) to jumpstart your design with notifications and social feeds
 
 ## 🛠 Installation