remove quotes in code example (#29812)

Co-authored-by: Johannes <johannes.kolbe@tech.better.team>

docs/source/en/model_doc/llava_next.md

@@ -107,7 +107,7 @@ from transformers import LlavaNextForConditionalGeneration, BitsAndBytesConfig
 quantization_config = BitsAndBytesConfig(
     load_in_4bit=True,
     bnb_4bit_quant_type="nf4",
-    bnb_4bit_compute_dtype="torch.float16",
+    bnb_4bit_compute_dtype=torch.float16,
 )
 
 model = LlavaNextForConditionalGeneration.from_pretrained("llava-hf/llava-v1.6-mistral-7b-hf", quantization_config=quantization_config, device_map="auto")