chore(docs): Document helper functions added in #3595
chore(docs): Document helper functions added in #3595

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