am a6602f1f: Add docs for SDK update. Add redirects for preview files. Manually integrate a few doc changes from cupcake.

Merge commit 'a6602f1fe4590e48c760f21ce29a92629240c463' into eclair

* commit 'a6602f1fe4590e48c760f21ce29a92629240c463':
  Add docs for SDK update.
tree: a8d8b2ab486ed3d83536a4633547caaeb1a4a626
  1. awt/
  2. camera/
  3. cmds/
  4. include/
  5. libs/
  6. opengl/
  7. vpn/
  8. MODULE_LICENSE_APACHE2
  9. NOTICE