[bug fix] use npu phy id in container env (#14266)

Co-authored-by: jinke15 <jinke15@jd.com>

docs/advanced_features/pd_disaggregation.md

@@ -276,6 +276,10 @@ Use mooncake backend, more details can be found in mooncake section.
 ```bash
 export ENABLE_ASCEND_TRANSFER_WITH_MOONCAKE=true
 ```
+ASCEND_NPU_PHY_ID need to be set in container env
+```bash
+export ASCEND_NPU_PHY_ID=xxx
+```
 
 
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