Previously, the security risks and our recommendations on how to
mitigate them were not documented as clearly as they could have been.
This commit makes some changes to try to address this:

1. The security risk is now noted at the beginning of the section
2. The recommendation to use SSL is now documented more prominently
   and an alternative recommendation to only use remote support on
   a trusted network has been added.
3. The example secret has been removed to prevent copy and paste
4. A recommendation to use a secret that is unique and strong has been
   added

Closes gh-18825