Update README

Author: Zongwei9888

README.md

@@ -547,11 +547,11 @@ default_search_server: "brave"
 ```
 
 **Available Options:**
-- **🔍 Brave Search** (`"brave"`): 
+- **🔍 Brave Search** (`"brave"`):
  - Default option with high-quality search results
  - Requires BRAVE_API_KEY configuration
  - Recommended for most users
- 
+
 - **🌐 Bocha-MCP** (`"bocha-mcp"`):
  - Alternative search server option
  - Requires BOCHA_API_KEY configuration