refactor(passthrough): rename flow for clarity

Author: Pouyanpi

nemoguardrails/colang/v2_x/library/passthrough.co

@@ -1,7 +1,7 @@
 
 import llm
 
-flow prompting llm with raw message
+flow context free bot response generation on unhandled user intent
   """Just make a call to LLM in passthrough mode"""
 
   activate polling llm request response
@@ -23,4 +23,4 @@ flow prompting llm with raw message
 flow llm continuation
   activate automating intent detection
   activate generating user intent for unhandled user utterance
-  activate prompting llm with raw message
+  activate context free bot response generation on unhandled user intent