fix values and add comments

A bad default value causes the following error during deployment

│ Containers:                                                                                                                                         │
│   sdelements-sdelements-mailer:                                                                                                                     │
│     Container ID:                                                                                                                                   │
│     Image:          registry1.dso.mil/ironbank/security-compass/sd-elements/exim:%!s(float64=1.1)                                                   │