docs(ag-ui): correct module name in docs

Correct example modules name in the documentation.

Author: stevenh

docs/ag-ui.md

@@ -238,7 +238,7 @@ pip/uv-add pydantic-ai-examples
 Direct, which supports command line flags:
 
 ```shell
-python -m pydantic_ai.ag_ui_examples.dojo_server --help
+python -m pydantic_ai_ag_ui_examples.dojo_server --help
 usage: dojo_server.py [-h] [--port PORT] [--reload] [--no-reload] [--log-level {critical,error,warning,info,debug,trace}]
 
 PydanticAI AG-UI Dojo server