Updates the setting for the provided _id.
The _id of a setting is the first argument of the RocketChat.settings.add method used in Rocket.Chat/packages/rocketchat-lib/server/startup/settings.js (among other files). For example, the following code in that settings.js file
This is a companion discussion topic for the original entry at https://rocket.chat/docs/developer-guides/rest-api/settings/update/