am 5305627d: Doc change: New doc that describes how market filters work

Merge commit '5305627d5b78b8d63ce344c4eb5d1a28ef44d3d0' into froyo-plus-aosp

* commit '5305627d5b78b8d63ce344c4eb5d1a28ef44d3d0':
  Doc change: New doc that describes how market filters work