Update the reverse functional association

https://gerrit.openbmc-project.xyz/#/c/9180/ changed the reverse
functional association to "functional". This updates the
documentation to reflect that.

Change-Id: Idbe0142f2d6c9aafd1151a8839e07a72fd58be94
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
2 files changed