CONTRIBUTING: clarify two sections
Various edits to the contribution guide, including:
- Linking to the install go-codereview section
- Adding an example of a cross repo reference
Signed-off-by: Cedric Charly <cedric.charly@gmail.com>
Change-Id: I859f6ae7f8ffd27f09948b3bb0cb41d97b2b548c
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1171864
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Reviewed-by: Paul Jolly <paul@myitcv.io>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
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