Update Support Policy header to h2

Author: VirajAgarwal1

README.md

@@ -24,7 +24,7 @@ The project has full documentation of the API at [cbl-reactnative.dev](https://c
 
 ---
 
-# 📢 Support Policy
+## 📢 Support Policy
 
 We truly appreciate your interest in this project!  
 This project is **community-maintained**, which means it's **not officially supported** by our support team.