ksmbd: fix kernel-doc warnings in smb2_lease_break_noti()

ksmbd: fix kernel-doc warnings in smb2_lease_break_noti()

kernel test robot report missing kernel-doc descriptions for the 'wait_ack'
and 'inc_epoch' parameters of smb2_lease_break_noti():

  Warning: fs/smb/server/oplock.c:937 function parameter 'wait_ack' not
   described in 'smb2_lease_break_noti'
  Warning: fs/smb/server/oplock.c:937 function parameter 'inc_epoch' not
   described in 'smb2_lease_break_noti'

Document both parameters to silence the warnings.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>