simplify readme

Former-commit-id: 0da6ec2d516326fe9c7583ba71cd1778eb838178

examples/lora_single_gpu/prepare.sh

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+#!/bin/bash
+
+CUDA_VISIBLE_DEVICES= python ../../src/train_bash.py \
+    --stage sft \
+    --do_train \
+    --model_name_or_path meta-llama/Llama-2-7b-hf \
+    --dataset alpaca_gpt4_en,glaive_toolcall \
+    --dataset_dir ../../data \
+    --template default \
+    --finetuning_type lora \
+    --lora_target q_proj,v_proj \
+    --output_dir ../../saves/LLaMA2-7B/lora/sft \
+    --overwrite_cache \
+    --overwrite_output_dir \
+    --cutoff_len 1024 \
+    --preprocessing_num_workers 16 \
+    --max_samples 3000 \
+    --tokenized_path ../../saves/datasets/sft