Document hazards of plugin settings API

[dphfox]

Changes

Adding more information about failure modes and undocumented hazards of plugin settings APIs (:GetSetting()/:SetSetting()).

https://devforum.roblox.com/t/pluginsetsetting-does-not-escape-strings/2399187 https://devforum.roblox.com/t/plugingetsetting-andor-pluginsetsetting-keys-may-not-contain-certain-chars/9120 https://devforum.roblox.com/t/pluginsetsetting-plugingetsetting-do-not-function-as-intended/1307736 https://devforum.roblox.com/t/pluginsetsetting-problem/6801

(+ my own experience developing plugins and dealing with data loss in production.)

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[github-actions[bot]]

This pull request has been inactive for 14 days. If it remains inactive for another 7 days, it will close. Please update or comment on this pull request to keep it open. 🙏