[B.A.T.M.A.N.] kerneldoc cleanups

Hi,

just some minor kerneldoc cleanups of things I found while running

(./scripts/kernel-doc -v -list net/batman-adv/*.{c,h} 2>&1 > /dev/null)| \ grep -v Scanning|grep -v -e BATADV_TQ_LOCAL_WINDOW_SIZE \ -e "Excess struct/union/enum/typedef member 'bcast_bits' description in 'batadv_orig_node'" \ -e "Excess struct/union/enum/typedef member 'real_bits' description in 'batadv_neigh_ifinfo_bat_iv'" \ -e '#ifdef' -e "#define" -e '#endif' \ -e "[0-9]* warnings" \ -e 'no structured comments found'

There are still some warnings left.

Kind regards, Sven