doc: syscall: reorg driver numbers

[bradjc]

Pull Request Overview

I think some of the categorization could be improved. Note, this doesn't renumber anything, just organize in a more consistent way.

I'm not sure if there is a strong case to re-number before the next release.

Testing Strategy

n/a

TODO or Help Wanted

We don't need to make this change, but I think some categories assignments were done before we really had categories.

Documentation Updated

• [x] Updated the relevant files in /docs, or no updates are required.

Formatting

• [x] Ran make prepush.

[bradjc]

Seems good.