am c7d1ee8b: docs only. add new Updating Your SDK doc; update the \'android\' tool documentation.

Merge commit 'c7d1ee8b235fa947c6223d1a28363c269c5ae771' into eclair

* commit 'c7d1ee8b235fa947c6223d1a28363c269c5ae771':
  docs only.