Document that disabledBranch for project overrides the global setting
Document that disabledBranch for project overrides the global setting

Signed-off-by: Edwin Kempin <d43fb6c98c97e553b671ed9a9318100f1de386e7@google.com>
Change-Id: I6fa3e915cafd4d6c50139cffe517127fdc13b82d

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