Merge pull request modelcontextprotocol#1568 from a-akimov/main

Docs: Update Python server code to reflect the sample

Author: jonathanhefner

docs/docs/develop/build-server.mdx

@@ -252,9 +252,12 @@ Forecast: {period['detailedForecast']}
 Finally, let's initialize and run the server:
 
 ```python
-if __name__ == "__main__":
+def main():
     # Initialize and run the server
     mcp.run(transport='stdio')
+
+if __name__ == "__main__":
+    main()
 ```
 
 Your server is complete! Run `uv run weather.py` to start the MCP server, which will listen for messages from MCP hosts.