fix: typo in ch07.ipynb (#612)

ch07/01_main-chapter-code/ch07.ipynb

@@ -2815,7 +2815,7 @@
    "source": [
     "## Summary and takeaways\n",
     "\n",
-    "- See the [./gpt_instruction_finetuning.py](./gpt_instruction_finetuning.py) script, a self-contained script for classification finetuning\n",
+    "- See the [./gpt_instruction_finetuning.py](./gpt_instruction_finetuning.py) script, a self-contained script for instruction finetuning\n",
     "- [./ollama_evaluate.py](./ollama_evaluate.py) is a standalone script based on section 7.8 that evaluates a JSON file containing \"output\" and \"response\" keys via Ollama and Llama 3\n",
     "- The [./load-finetuned-model.ipynb](./load-finetuned-model.ipynb) notebook illustrates how to load the finetuned model in a new session\n",
     "- You can find the exercise solutions in [./exercise-solutions.ipynb](./exercise-solutions.ipynb)"