Fix section headers in Logfire MCP server docs (#986)

Author: rmaceissoft

docs/how-to-guides/mcp-server.md

@@ -52,7 +52,7 @@ it by creating a `.cursor/mcp.json` file in your project root:
 For more detailed information, you can check the
 [Cursor documentation](https://docs.cursor.com/context/model-context-protocol).
 
-### Claude Desktop
+#### Claude Desktop
 
 [Claude Desktop](https://claude.ai/download) is a desktop application for the popular
 LLM Claude.
@@ -79,7 +79,7 @@ You can configure it to use the MCP server by adding the following configuration
 Check out the [MCP quickstart](https://modelcontextprotocol.io/quickstart/user)
 for more information.
 
-### Cline
+#### Cline
 
 [Cline](https://docs.cline.bot/) is a popular chatbot platform that supports MCP servers.