Update llm.md (#164)

Without the print on the `llm` call, the new user sees no visible effect
when just getting started. The assumption here is the new user is
running this in a new sandbox script file or repl via copy-paste.

docs/getting_started/llm.md

@@ -21,5 +21,5 @@ We can now call it on some input!
 
 ```python
 text = "What would be a good company name a company that makes colorful socks?"
-llm(text)
+print(llm(text))
 ```