docs: add missing main.py in CLI Option Name tutorial check

Fix an issue in the documentation where the check for tutorial 001 in https://typer.tiangolo.com/tutorial/options/name/ 
does not include `main.py`, as it must.

docs/tutorial/options/name.md

@@ -69,7 +69,7 @@ Options:
   --help                Show this message and exit.
 
 // Try it
-$ python --name Camila
+$ python main.py --name Camila
 
 Hello Camila
 ```