docs: Fix style issue by removing ending backslash

Author: Raboro

README.md

@@ -78,7 +78,7 @@ and servers, both online and offline.
 
 ### Features
 
-🏁 **Very first [on-device vector database](https://docs.objectbox.io/on-device-ann-vector-search)** - for AI apps that work any place.\
+🏁 **Very first [on-device vector database](https://docs.objectbox.io/on-device-ann-vector-search)** - for AI apps that work any place.
 
 🏁 **High performance** - superfast response rates enabling real-time applications.\
 🪂 **ACID compliant** - Atomic, Consistent, Isolated, Durable.\