api: update comment
api: update comment

Signed-off-by: ISHIDA Wataru <15703620d0b11e835ab4f34ebf88f2f40cce783e@lab.ntt.co.jp>

h-naoto/gobgp,a16/gobgp,tamihiro/gobgp,a16/gobgp,ramrunner/gobgp,a16/gobgp,a16/gobgp,fujita/gobgp,Dipsingh/gobgp,YujiOshima/gobgp,h-naoto/gobgp,osrg/gobgp,fujita/gobgp,ramrunner/gobgp,YujiOshima/gobgp,a16/gobgp,tamihiro/gobgp,ishidawataru/gobgp,YujiOshima/gobgp,j-kato/gobgp,Dipsingh/gobgp,osrg/gobgp,tamihiro/gobgp,a16/gobgp,ishidawataru/gobgp,j-kato/gobgp,fujita/gobgp,osrg/gobgp,fujita/gobgp,ramrunner/gobgp,j-kato/gobgp,h-naoto/gobgp,a16/gobgp,tamihiro/gobgp,Dipsingh/gobgp,ishidawataru/gobgp,osrg/gobgp