User guide: Make clear that label functions are orthogonal to code owners
User guide: Make clear that label functions are orthogonal to code owners

Often it is not clear that the label function "MaxWithBlock" can still
block the change submission after sufficent code owner approvals have
been applied.

Signed-off-by: Edwin Kempin <d43fb6c98c97e553b671ed9a9318100f1de386e7@google.com>
Change-Id: I27cb9f8efaf44b269737cca90dc9da5fa127a034

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