The '-h' positional argument is in the wrong location in the usage example

[FiXato]

The usage example puts -h directly after the command:
usage: twitch-dl [-h] [--version] {videos,clips,download,info} ...

However, if I want extra info on for example the twitch-dl download command, I need to use twitch-dl download -h, rather than twitch-dl -h download, which is what I would expect based on the given usage syntax.

(Ideally both formats would work, but if that's not an option, I'd suggest to update the usage example rather than the -h position, to not break backwards-compatibility.)