Fix i2c doxy and update i2c_access.H doxy to match fapi2_access_i2c.H
Fix i2c doxy and update i2c_access.H doxy to match fapi2_access_i2c.H

Change-Id: I9e6472737d21f125c688f2e4e805c7f474e072ae
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/64178
Tested-by: HWSV CI <ae069ce3805842f4ed79e0ef7868baadb5df0a6b@us.ibm.com>
Tested-by: Hostboot CI <52521565bd8ea18a2b112942dce4f4220a97c2c8@us.ibm.com>
Tested-by: Jenkins Server <8e3f934e4c44875bc48d33da3ea13d93ba9a233f@us.ibm.com>
Reviewed-by: Louis Stermole <a2bef96d502debd02962600aef4d81d949c35039@us.ibm.com>
Reviewed-by: Matt K. Light <19ba8ed73a0b3c376c81fced381f1ac0f483b7c2@us.ibm.com>
Tested-by: PPE CI <dc75934ba5befb9221434e67a247b93aec46b36b@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <ab93eca12e43608f33daa16a67357cd7b7e867ab@us.ibm.com>

open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot