Update group names to lldap convention: parking_admins, managers

deploy/DEPLOY.md

@@ -95,9 +95,9 @@ parking.rocketscale.it {
 
 In lldap (https://ldap.rocketscale.it):
 
-1. Create group: `parking-admins`
-2. Create group: `parking-managers`
-3. Add yourself to `parking-admins`
+1. Create group: `parking_admins` (follows lldap naming convention)
+2. Create group: `managers` (reusable across apps)
+3. Add yourself to `parking_admins`
 
 ## Step 7: Deploy