Fix incorrect instructions for the -d parameter

Author: johnbaro

docs/guide/durability/managing.md

@@ -183,7 +183,7 @@ dotnet run -- db-list
 # └────────────────────────────────────────┴───────────────────────────┘
 ```
 
-Once you've identified the database, pass either _DatabaseUri_ or _SubjectUri_ to the `db-dump` command with the `-d` parameter:
+Once you've identified the database, pass the `-d` parameter with the `SubjectUri` from the output above to the `db-dump` command:
 
 ```bash
 dotnet run -- db-dump -d marten://store/ export_marten.sql