Bug in `usage_whisper` msg-id on NOTICE message

I was testing whispers in IRC yesterday and came across the following:

Looks the received message has been constructed with Golang’s fmt.Printf(). The string argument there is missing and %!s(MISSING) is a standard response in this scenario. Could someone have a look at the code behind it and fix the typo?

After looking at msg-id documentation, I’ve noticed that this tag is either not documented or there’s an older version of it (whisper_invalid_args).
Please update your documentation accordingly with new changes…