Docs: Getting Started Self-Hosting unleash (#6019)

## About the changes

put UNLEASH_DEFAULT_ADMIN_PASSWORD inside ``

website/docs/using-unleash/deploy/getting-started.md

@@ -34,7 +34,7 @@ To run multiple replicas of Unleash simply point all instances to the same datab
 If you'd like the default admin user to be created with a different username and password, you may define the following environment variables when running Unleash:
 
 - `UNLEASH_DEFAULT_ADMIN_USERNAME`
-- UNLEASH_DEFAULT_ADMIN_PASSWORD
+- `UNLEASH_DEFAULT_ADMIN_PASSWORD`
 
 The way of defining these variables may vary depending on how you run Unleash.