Add documentation about read-only mode in API. (#9317)
Add documentation about read-only mode in API. (#9317)

* Add documentation about read-only mode in API.

Fixes #9316
mozilla/addons-server,kumar303/olympia,bqbn/addons-server,atiqueahmedziad/addons-server,mozilla/addons-server,bqbn/addons-server,wagnerand/olympia,kumar303/olympia,eviljeff/olympia,psiinon/addons-server,wagnerand/addons-server,wagnerand/olympia,bqbn/addons-server,kumar303/addons-server,diox/olympia,aviarypl/mozilla-l10n-addons-server,kumar303/addons-server,kumar303/olympia,aviarypl/mozilla-l10n-addons-server,mozilla/olympia,aviarypl/mozilla-l10n-addons-server,aviarypl/mozilla-l10n-addons-server,diox/olympia,eviljeff/olympia,psiinon/addons-server,atiqueahmedziad/addons-server,eviljeff/olympia,kumar303/addons-server,wagnerand/addons-server,wagnerand/olympia,atiqueahmedziad/addons-server,psiinon/addons-server,atiqueahmedziad/addons-server,diox/olympia,wagnerand/addons-server,mozilla/addons-server,diox/olympia,kumar303/addons-server,bqbn/addons-server,wagnerand/olympia,psiinon/addons-server,mozilla/olympia,mozilla/olympia,kumar303/olympia,mozilla/addons-server,wagnerand/addons-server,eviljeff/olympia,mozilla/olympia