Update fine-tuning-cli-guide.mdx

fern/docs/text-gen-solution/fine-tuning-cli-guide.mdx

@@ -72,13 +72,15 @@ We accept JSONL files in which each line is a JSON object. Prepare your JSONL da
 See the following for examples of different data formats:
 
 **a. Chat Completion Format Example:**
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 Each message object has a role (either system, user, or assistant) and content.
 - The system message (optional): Can be used to set the behavior of the assistant.
 - The user messages (required): Provide requests or comments for the assistant to respond to.
 - The assistant messages (required): Store previous assistant responses, but can also be written by you to give examples of desired behavior.
 - Tool calls (optional): Allow for triggering specific actions or functions within the assistant or integrating external functionalities to enhance the conversation.
 
 Here are some examples in chat completion format.
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 Single-turn example:
 
 ```json