ADMIN_MEDIA_PREFIX should still be visible in docs
|Reported by:||Claude Paroz||Owned by:||nobody|
|Cc:||Triage Stage:||Ready for checkin|
|Has patch:||yes||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
ADMIN_MEDIA_PREFIX is now a deprecated setting. However, the commit  simply deleted the setting from the docs, instead of moving it to the deprecated section.