refactor(docs): Remove unused `mailcheck` and `webChannelId` query params. (#5048) r=vladikoff
refactor(docs): Remove unused `mailcheck` and `webChannelId` query params. (#5048) r=vladikoff


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