Fix recipes documentation.
Fix recipes documentation.

This CL updates documentation for the properties part of the recipes system.
I change the name of an argument, but forgot to update the docs. Oops.

R=iannucci@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1310373006

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@296462 0039d316-1c4b-4281-b951-d872f2087c98

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