[Doc] Clearer corresponding relationship between configurations for multi-node guides (#3441)

Optimize multi-node guide: more clearer corresponding relationship
between configuration items and nodes

### What this PR does / why we need it?
Some issues caused by misunderstandings due to unclear guidance content,
for example: #3367

### Does this PR introduce _any_ user-facing change?
NA
### How was this patch tested?
NA

- vLLM version: v0.11.0rc3
- vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.0

Signed-off-by: leo-pony <nengjunma@outlook.com>

docs/source/tutorials/multi_node_qwen3vl.md

@@ -59,7 +59,7 @@ node0
 ```shell
 #!/bin/sh
 # this obtained through ifconfig
-# nic_name is the network interface name corresponding to local_ip
+# nic_name is the network interface name corresponding to local_ip of the current node
 nic_name="xxxx"
 local_ip="xxxx"
 
@@ -97,8 +97,12 @@ node1
 ```shell
 #!/bin/sh
 
+# this obtained through ifconfig
+# nic_name is the network interface name corresponding to local_ip of the current node
 nic_name="xxxx"
 local_ip="xxxx"
+
+# The value of node0_ip must be consistent with the value of local_ip set in node0 (master node)
 node0_ip="xxxx"
 
 export HCCL_IF_IP=$local_ip