Updated recipe documentation.
Updated recipe documentation.

BUG=500765
TBR=iannucci@chromium.org,pgervais@chromium.org

Review URL: https://codereview.chromium.org/1186763003

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@295693 0039d316-1c4b-4281-b951-d872f2087c98

shishkander/recipes-py,luci/recipes-py,shishkander/recipes-py,luci/recipes-py