Fix typo in pissa finetune readme

[JamesSand]

There is a trivial typo in pissa finetune readme, I just fix it

Before

import torch
from peft import LoraConfig, get_peft_model
from transformers import AutoTokenizer, AutoModelForCausalLMfrom trl import SFTConfig, SFTTrainer
from datasets import load_dataset

After I fix

import torch
from peft import LoraConfig, get_peft_model
from transformers import AutoTokenizer, AutoModelForCausalLM
from trl import SFTConfig, SFTTrainer
from datasets import load_dataset

[HuggingFaceDocBuilderDev]

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[BenjaminBossan]

Thanks for fixing this typo in the PiSSA README, LGTM. Failing CI is unrelated.