Update docker.md

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

Author: istvano

docker.md

@@ -57,7 +57,7 @@ docker exec -it "couchbase_vault" /bin/ash -c "vault login password && vault wri
 ### Create database config
 
 You can use the following command to create a database config that sets up the connection to your Capella cluster.
-Make sure to replace the variables. Please keep in mind the Capella secret you download is base64 encoded. You need to decode it and grab the username and password from that secret. They are separated by :
+Make sure to replace the variables. Please keep in mind the Capella secret you download is base64 encoded. You need to decode it and grab the username and password from that secret; they are separated by a colon character (`:`), for example `username:password`.
 
 ```bash
 docker exec -it "couchbase_vault" /bin/ash -c 'vault login password && vault write database/config/couchbasecapella-database-plugin plugin_name="couchbasecapella-database-plugin" cloud_api_base_url="https://cloudapi.cloud.couchbase.com/v4" organization_id="$your_capella_organization_id" project_id="$your_capella_project_id" cluster_id="$your_capella_cluster_id" username="$your_capella_access_key_name" password="$your_capella_access_key_secret" password_policy="couchbasecapella" allowed_roles="*"'