Update pve_precheck.md

docs/guide/pve_precheck.md

@@ -55,16 +55,22 @@ curl -L https://ghproxy.com/https://raw.githubusercontent.com/spiritLHLS/addswap
 
 国际
 
-```
+```bash
 bash <(wget -qO- --no-check-certificate https://raw.githubusercontent.com/spiritLHLS/pve/main/scripts/check_kernal.sh)
 ```
 
 国内
 
-```
+```bash
 bash <(wget -qO- --no-check-certificate https://ghproxy.com/https://raw.githubusercontent.com/spiritLHLS/pve/main/scripts/check_kernal.sh)
 ```
 
+如果你需要更新IPV6信息再查询，那么执行以下命令后再查询
+
+```bash
+rm -rf /usr/local/bin/pve_ipv6*
+```
+
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