Update docker.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: istvano

docker.md

@@ -32,7 +32,7 @@ docker exec -it "couchbase_vault" /bin/ash -c "vault login password && vault sec
 ### Register the plugin
 
 The multi-stage docker container first builds the plugin. It also generates the SHA256 and saves it the following file:
-*/vault/vault-plugin-database-couchbasecapella.sha256*
+*/vault/couchbasecapella-database-plugin.sha256*
 
 ```bash
 docker exec -it "couchbase_vault" /bin/ash -c "SHA256=\$(cat /vault/couchbasecapella-database-plugin.sha256) && vault login password && vault write sys/plugins/catalog/database/couchbasecapella-database-plugin sha256=\$SHA256 command=couchbasecapella-database-plugin"