FIX Deprecations in MiSS example (#2704)

Also, was validated on XPU.

---------

Signed-off-by: Yao, Matrix <matrix.yao@intel.com>

examples/miss_finetuning/README.md

@@ -41,7 +41,7 @@ trainer = SFTTrainer(
     model=peft_model,
     args=training_args,
     train_dataset=dataset,
-    tokenizer=tokenizer,
+    processing_class=tokenizer,
 )
 trainer.train()
 peft_model.save_pretrained("miss-llama-2-7b")
@@ -101,4 +101,4 @@ python miss_finetuning.py \
       archivePrefix={arXiv},
       primaryClass={cs.CL},
       url={https://arxiv.org/abs/2409.15371}, 
-}
+}

examples/miss_finetuning/miss_finetuning.py

@@ -92,7 +92,7 @@ trainer = SFTTrainer(
     model=peft_model,
     args=script_args,
     train_dataset=dataset,
-    tokenizer=tokenizer,
+    processing_class=tokenizer,
 )
 trainer.train()
 trainer.save_state()