typo and remove example hash

Author: fernandinand

src/server/upgrade/index.md

@@ -17,11 +17,11 @@ Perform the migration:
 
 <MigrationType type="EE" />
 
-1. Add/modify environment variables in [.prod.env]([prod.env](https://github.com/MerginMaps/server/blob/master/.prod.env#L57))
+1. Add/modify environment variables in [.prod.env](https://github.com/MerginMaps/server/blob/master/.prod.env#L57)
 
    ```bash
-       SECURITY_EMAIL_SALT='b1UHe3sa3kc6r8ieTt8U'
-       SECURITY_BEARER_SALT='k1Cv9X7sMIxUa7bScMhH'
+       SECURITY_EMAIL_SALT='<YOUR STRONG HASH>'
+       SECURITY_BEARER_SALT='<YOUR STRONG HASH>'
    ```
 
 2. Start up your docker containers