chore(client): Documentation/defaults cleanup of the Base Verification model.
chore(client): Documentation/defaults cleanup of the Base Verification model.

I noticed the return types of a couple of functions were `Boolen` instead
of `boolean`, and no `defaults` or default `validation` objects were set.

mozilla/fxa-content-server,shane-tomlinson/fxa-content-server,swatilk/fxa-content-server,shane-tomlinson/fxa-content-server,mozilla/fxa-content-server,swatilk/fxa-content-server,mozilla/fxa-content-server,shane-tomlinson/fxa-content-server,vladikoff/fxa-content-server,vladikoff/fxa-content-server,swatilk/fxa-content-server,vladikoff/fxa-content-server