am cd4e1c46: am f151391b: fix markup errors in action bar styling, add more information about using drawables, move \'managing the activity lifecycle\' down a notch, because it\'s less interesting.

* commit 'cd4e1c463eab530657bead6e79efa3215924f1b0':
  fix markup errors in action bar styling, add more information about using drawables, move 'managing the activity lifecycle' down a notch, because it's less interesting.