groups.json uses dash, command JSON uses underscore

[stockholmux]

I'm working on valkey-io/valkey-io.github.io#150 using the groups.json file to get human readable descriptions from command JSON group fields.

Everything corresponds between the files except sorted set in command JSON files are grouped as sorted_set and the groups.json uses sorted-set.

I can work around this but it's annoying that we're not consistent. I'd be in favour of changing groups.json to reflect the field in the command JSON. Will this break the man page generation script?