docs: Register i2c docs I2C docs were added to the repository, but not registered in the doc tree. Change-Id: Ie4013d6febd6e379c0197906af086ee7d8543ba1 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/45081 Pigweed-Auto-Submit: Armando Montanez <amontanez@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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