[Doc] add load_format items in docs (#14804)

Signed-off-by: wwl2755 <wangwenlong2755@gmail.com>

vllm/engine/arg_utils.py

@@ -339,9 +339,15 @@ class EngineArgs:
             'CoreWeave. See the Tensorize vLLM Model script in the Examples '
             'section for more information.\n'
             '* "runai_streamer" will load the Safetensors weights using Run:ai'
-            'Model Streamer \n'
+            'Model Streamer.\n'
             '* "bitsandbytes" will load the weights using bitsandbytes '
-            'quantization.\n')
+            'quantization.\n'
+            '* "sharded_state" will load weights from pre-sharded checkpoint '
+            'files, supporting efficient loading of tensor-parallel models\n'
+            '* "gguf" will load weights from GGUF format files (details '
+            'specified in https://github.com/ggml-org/ggml/blob/master/docs/gguf.md).\n'
+            '* "mistral" will load weights from consolidated safetensors files '
+            'used by Mistral models.\n')
         parser.add_argument(
             '--config-format',
             default=EngineArgs.config_format,