Update comments and add explanations

src/khoj/processor/conversation/gpt4all/chat_model.py

@@ -124,11 +124,9 @@ def converse_offline(
     """
     gpt4all_model = loaded_model or GPT4All(model)
     # Initialize Variables
-    current_date = datetime.now().strftime("%Y-%m-%d")
     compiled_references_message = "\n\n".join({f"{item}" for item in references})
 
     # Get Conversation Primer appropriate to Conversation Type
-    # TODO If compiled_references_message is too long, we need to truncate it.
     if compiled_references_message == "":
         conversation_primer = user_query
     else:

src/khoj/processor/conversation/gpt4all/utils.py

@@ -19,6 +19,7 @@ def download_model(model_name: str):
     if os.path.exists(filename):
         return GPT4All(model_name)
 
+    # Download the model to a tmp file. Once the download is completed, move the tmp file to the actual file
     tmp_filename = filename + ".tmp"
 
     try: