am 5cfa877e: am eb4ef072: am 5249ad03: docs: add "boot completed" broadcast to list of DO NOTs for installing on external storage bug: 3088494

Merge commit '5cfa877e22a2d76d1ea36c3f0c2c708248da3d0e'

* commit '5cfa877e22a2d76d1ea36c3f0c2c708248da3d0e':
  docs: add "boot completed" broadcast to list of DO NOTs for installing on external storage