am 214ea8f1: am 3af366dd: am 462cc377: docs: implement sdk announcement in a collapsible box and revise the \'special\' box color and add rounded corners.

Merge commit '214ea8f14ee2b62b80905ad038110066f95be84b' into eclair-mr2-plus-aosp

* commit '214ea8f14ee2b62b80905ad038110066f95be84b':
  docs: implement sdk announcement in a collapsible box