[Doc][Neuron] Update documentation for Neuron (#18868)

Signed-off-by: Elaine Zhao <elaineyz@amazon.com>

vllm/config.py

@@ -380,7 +380,7 @@ class ModelConfig:
     """Initialize non-default neuron config or override default neuron config
     that are specific to Neuron devices, this argument will be used to
     configure the neuron config that can not be gathered from the vllm
-    arguments. e.g. `{"cast_logits_dtype": "bloat16"}`."""
+    arguments. e.g. `{"cast_logits_dtype": "bfloat16"}`."""
     pooler_config: Optional["PoolerConfig"] = field(init=False)
     """Pooler config which controls the behaviour of output pooling in pooling
     models."""