am 589622a4: (-s ours) am e0cc9e30: am 24bbcd50: (-s ours) DO NOT MERGE cherrypick from jb-devChange-Id: I6eb11d3629dd13d2c7ac297cc9fa3828ed59f170 add style for code captions; ignore sidenav headers for HRs

* commit '589622a47da216ab2b31e94011ae9985e4029891':
  DO NOT MERGE cherrypick from jb-devChange-Id: I6eb11d3629dd13d2c7ac297cc9fa3828ed59f170 add style for code captions; ignore sidenav headers for HRs