Add comment on removeSettingWarning

Author: lunny

modules/setting/config_provider.go

@@ -334,6 +334,7 @@ func deprecatedSetting(rootCfg ConfigProvider, oldSection, oldKey, newSection, n
 // make linter happy when there is no deprecated setting at the moment
 var _ = deprecatedSetting
 
+// removedSettingWarning is a warning about a setting that has already been removed, giving the user a last chance to fix their app.ini
 func removedSettingWarning(rootCfg ConfigProvider, oldSection, oldKey, newSection, newKey, version string) {
 	if rootCfg.Section(oldSection).HasKey(oldKey) {
 		LogStartupProblem(1, log.ERROR, "Removed: config option `[%s].%s` presents, please use `[%s].%s` instead because this setting has been removed in %s", oldSection, oldKey, newSection, newKey, version)