stellar tx new subcommands have long difficult to read helps

[leighmcculloch]

What version are you using?

22.0.1

What did you do?

$ stellar tx new

What did you expect to see?

Succinct one-liners for each type of operation. Easy to read and parse. Longer details only when drilling into each command, for example with stellar tx new create-account --help.

What did you see instead?

[estherbreath]

Can I work on this, please?

[janewang]

@estherbreath Yes feel free to pick up this one. I think the formatting could be intended where descriptions are tabbed in