setup-guide: Recommend to disable code owners for refs/meta/config branches

The refs/meta/config branches do not contain source code, but the
project configuration. Usually only the project owners can make changes
here and requiring code owner approvals is unneeded.

Bug: Google b/420567912
Change-Id: I3977e3486810ff052bcded15baff432ac4c6f9d0
Signed-off-by: Edwin Kempin <ekempin@google.com>

resources/Documentation/setup-guide.md

diff --git a/resources/Documentation/setup-guide.md b/resources/Documentation/setup-guide.md
index af9c08f..0b63877 100644
--- a/resources/Documentation/setup-guide.md
+++ b/resources/Documentation/setup-guide.md
@@ -171,9 +171,14 @@
 `code-owners.config`:
 ```
   [codeOwners]
+    disabledBranch = refs/meta/config
     disabledBranch = ^refs/heads/stable-.*
 ```
 
+**TIP:** Consider disabling the code owners functionality for `refs/meta/config`
+branches, so that changes to the project configuration do not require code owner
+approvals.
+
 ### <a id="configureCodeOwnerApproval">4. Configure the label vote that should count as code owner approval
 
 By default `Code-Review+1` votes from [code owners](user-guide.html#codeOwners)