Document why root code owners are ranked lower
Document why root code owners are ranked lower

This is a question that comes up quite frequently. Document it so that
users can discover it on their own.

Signed-off-by: Edwin Kempin <d43fb6c98c97e553b671ed9a9318100f1de386e7@google.com>
Change-Id: Ie7b779c038b85e942ba422092878910969840271

GerritCodeReview/plugins_code-owners,GerritCodeReview/plugins_code-owners,GerritCodeReview/plugins_code-owners,GerritCodeReview/plugins_code-owners