cmd/cue: help mod edit: fix copy/paste error
This updates the help text emitted by "cue help mod edit" and replaces
some prose left in place from copying Go's equivalent help text.
Fixes #3401.
Signed-off-by: Jonathan Matthews <github@hello.jonathanmatthews.com>
Change-Id: I0d1b2859e00aacf69de30ad828706736bf763c5e
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1201449
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
authored by