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Also upgrade the cargo resolver to v3, the default.

New clippy lints:
- `next_back()` instead of `last()` for a double-ended iterator. That avoids walking the whole list.
- ` repeat_n` instead of `repeat.take`. That avoids cloning.
- Doc indenting

Co-authored-by: Julien Mancuso <jmancuso@nvidia.com>
Co-authored-by: Hannah Zhang <hannahz@nvidia.com>
Co-authored-by: Biswa Panda <biswa.panda@gmail.com>
Co-authored-by: Maksim Khadkevich <mkhadkevich@nvidia.com>

Co-authored-by: Neelay Shah <neelays@nvidia.com>