Simultaneous Edits can have a simpler rebase command

[edre]

In the part of Simultaneous Edits where we get to see the simultaneous rebasing, the rebasing command is given with a redundant revset.

We can rebase all of our PRs with one command:
`jj rebase -s 'all:roots(trunk..@)' -d trunk`

This command would work fine without the -s argument. The default of -b @ is equivalent to the revset you provided. I think it would be cleaner to provide the rebase command in its simpler form, then describe the underlying revset that does the magic.

[steveklabnik]

Thanks, I'll consider this!