docs: start command (a2aproject#22)

Co-authored-by: kthota-g <[email protected]>

Author: 2 people

examples/langgraph/README.md

@@ -15,7 +15,7 @@ An example LangGraph agent that helps with currency conversion.
 3. Start the server
 
    ```bash
-   uv run main.py
+   uv run .
    ```
 
 4. Run the test client