Tiny fix doc error (sgl-project#4795)

Author: fzyzcjy

docs/references/multi_node.md

@@ -9,9 +9,7 @@
 
 python3 -m sglang.launch_server --model-path meta-llama/Meta-Llama-3.1-405B-Instruct --tp 16 --dist-init-addr 172.16.4.52:20000 --nnodes 2 --node-rank 0
 
-# replace 172.18.45.52:20000 with your own node ip address and port of the second node
-
-python3 -m sglang.launch_server --model-path meta-llama/Meta-Llama-3.1-405B-Instruct --tp 16 --dist-init-addr 172.18.45.52:20000 --nnodes 2 --node-rank 1
+python3 -m sglang.launch_server --model-path meta-llama/Meta-Llama-3.1-405B-Instruct --tp 16 --dist-init-addr 172.16.4.52:20000 --nnodes 2 --node-rank 1
 ```
 
 Note that LLama 405B (fp8) can also be launched on a single node.