Document struct mok_state_variable better.
Document struct mok_state_variable better.

Add a pile of documentation comments to help remember what all the
fields in our mok mirroring structure do.

Signed-off-by: Peter Jones <2e0a021e603479ff81838c00c3b770daca4e0214@redhat.com>

rhinstaller/shim,rhinstaller/shim,rhinstaller/shim