Update container-registry-delete.md

remove the extra param in the command

Author: vickenliu

articles/container-registry/container-registry-delete.md

@@ -106,7 +106,7 @@ To maintain the size of a repository or registry, you might need to periodically
 The following Azure CLI command lists all manifest digests in a repository older than a specified timestamp, in ascending order. Replace `<acrName>` and `<repositoryName>` with values appropriate for your environment. The timestamp could be a full date-time expression or a date, as in this example.
 
 ```azurecli
-az acr manifest list-metadata --name <repositoryName> --registry <acrName> <repositoryName> \
+az acr manifest list-metadata --name <repositoryName> --registry <acrName> \
     --orderby time_asc -o tsv --query "[?lastUpdateTime < '2019-04-05'].[digest, lastUpdateTime]"
 ```