Docs：Update the style of llma 3.1 405B docs (#2789)

docs/backend/server_arguments.md

@@ -31,4 +31,3 @@ python -m sglang.launch_server --model-path meta-llama/Meta-Llama-3-8B-Instruct
 # Node 1
 python -m sglang.launch_server --model-path meta-llama/Meta-Llama-3-8B-Instruct --tp 4 --nccl-init sgl-dev-0:50000 --nnodes 2 --node-rank 1
 ```
-

docs/index.rst

@@ -56,9 +56,9 @@ The core features include:
    references/hyperparameter_tuning.md
    references/benchmark_and_profiling.md
    references/custom_chat_template.md
+   references/llama_405B.md
+   references/modelscope.md
    references/contribution_guide.md
    references/troubleshooting.md
    references/faq.md
    references/learn_more.md
-   references/llama_405B.md
-   references/modelscope.md

docs/references/llama_405B.md

-# Example: Run Llama 3.1 405B
+# Run Llama 3.1 405B
+
+## Run 405B (fp8) on a Single Node
 
 ```bash
-# Run 405B (fp8) on a single node
 python -m sglang.launch_server --model-path meta-llama/Meta-Llama-3.1-405B-Instruct-FP8 --tp 8
 ```
 
+## Run 405B (fp16) on Two Nodes
+
 ```bash
-# Run 405B (fp16) on two nodes
-## on the first node, replace the `172.16.4.52:20000` with your own first node ip address and port
+# on the first node, replace 172.16.4.52:20000 with your own node ip address and port
+
 python3 -m sglang.launch_server --model-path meta-llama/Meta-Llama-3.1-405B-Instruct --tp 16 --nccl-init-addr 172.16.4.52:20000 --nnodes 2 --node-rank 0
 
-## on the first node, replace the `172.16.4.52:20000` with your own first node ip address and port
-python3 -m sglang.launch_server --model-path meta-llama/Meta-Llama-3.1-405B-Instruct --tp 16 --nccl-init-addr 172.16.4.52:20000 --nnodes 2 --node-rank 1
-```
+# on the second node, replace 172.18.45.52:20000 with your own node ip address and port
 
+python3 -m sglang.launch_server --model-path meta-llama/Meta-Llama-3.1-405B-Instruct --tp 16 --nccl-init-addr 172.18.45.52:20000 --nnodes 2 --node-rank 1
+```