Fix new API reference documentation when a property has parameters

BUG=344038
NOTRY=true

Review URL: https://codereview.chromium.org/167893011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251820 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251820