Argument '--rpu-in' instead of '--rpu_in'

[manuelrn]

In the inject-rpu documentation, the example has --rpu-in argument, but it doesn't work and you need to use --rpu_in.

I think the ideal would be to change the argument to --rpu-in, instead of updating the documentation with --rpu_in, since all other arguments are also - and not _ (--rpu-out, extract-rpu).

Thanks and regards!

[quietvoid]

Indeed, that was pointed out to me. I'll fix it.