update example docs

examples/full_multi_gpu/llama3_full_predict.yaml

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+# model
+model_name_or_path: saves/llama3-8b/full/sft
+
+# method
+stage: sft
+do_predict: true
+finetuning_type: full
+
+# dataset
+dataset: identity,alpaca_gpt4_en
+template: llama3
+cutoff_len: 1024
+max_samples: 50
+overwrite_cache: true
+preprocessing_num_workers: 16
+
+# output
+output_dir: saves/llama3-8b/full/predict
+overwrite_output_dir: true
+
+# eval
+per_device_eval_batch_size: 1
+predict_with_generate: true