Update csi-debug.md

Author: andyzhangx

docs/csi-debug.md

@@ -102,7 +102,7 @@ export AZURE_STORAGE_ACCOUNT=
 export AZURE_STORAGE_ACCESS_KEY=
 # only for sovereign cloud
 # export AZURE_STORAGE_BLOB_ENDPOINT=accountname.blob.core.chinacloudapi.cn
-blobfuse test --container-name=CONTAINER-NAME --tmp-path=/tmp/blobfuse -o allow_other --file-cache-timeout-in-seconds=120
+blobfuse2 test --container-name=CONTAINER-NAME --tmp-path=/tmp/blobfuse -o allow_other --file-cache-timeout-in-seconds=120
 ```
 > You can find more detailed information about environment variables at https://github.com/Azure/azure-storage-fuse#environment-variables.