You can actually provide a corrected version to Siri by pressing the little "Tap to edit" under the transcript! I'm not sure if the correction ever get sent to

You can actually provide a corrected version to Siri by pressing the little "Tap to edit" under the transcript! I'm not sure if the correction ever get sent to Apple (maybe it's on-device training), but I've found after a while Siri accuracy improved a lot, e.g. no longer interpret "Log" as "Lock" when I said it.