bmc_json_config: Fix documentation for previous changes
bmc_json_config: Fix documentation for previous changes

This improves upon missing documentation changes for the introduction of
systemd unit status tracking code.

Change-Id: I40df3033eb75ea8549640590b3c8ae21117a8a4e
Signed-off-by: William A. Kennington III <30fff5198f4d10ca1117e5f3ec82f3b4b8900d81@google.com>

openbmc/phosphor-ipmi-flash