Fix AppendErrorMessage comments to include all properties
Fix AppendErrorMessage comments to include all properties

[#157935803]

Signed-off-by: Winna Bridgewater <8478e8b4d1baaa640a09edb56939e3354ff87a71@pivotal.io>

pivotal-cf/brokerapi,drnic/brokerapi,pivotal-cf/brokerapi