pw_presubmit: Add docs for upstream checks Change-Id: I5869de37d91e2ef390e30e0cbdad42d3cd084729 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/46361 Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com> Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com> Reviewed-by: Ewout van Bekkum <ewout@google.com>
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