Move Code Owners troubleshooting to new page

doc/user/project/codeowners/code_owners_troubleshooting.md

+---
+stage: Create
+group: Source Code
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://handbook.gitlab.com/handbook/product/ux/technical-writing/#assignments
+description: "Use Code Owners to define experts for your code base, and set review requirements based on file type or location."
+---
+
+## Troubleshooting Code Owners
+
+DETAILS:
+**Tier:** Premium, Ultimate
+**Offering:** GitLab.com, Self-managed, GitLab Dedicated
+
+When working with Code Owners, you might encounter the following issues.
+
+For more information about how the Code Owners feature handles errors, see the
+[Code Owners reference](reference.md).
+
+### Approvals shown as optional
+
+A Code Owner approval rule is optional if any of these conditions are true:
+
+- The user or group is not a member of the project.
+  Code Owners [cannot inherit members from parent groups](https://gitlab.com/gitlab-org/gitlab/-/issues/288851/).
+- [Code Owner approval on a protected branch](../protected_branches.md#require-code-owner-approval-on-a-protected-branch) has not been set up.
+- The section is [marked as optional](index.md#make-a-code-owners-section-optional).
+- No eligible code owners are available to approve the merge request due to conflicts
+  with other [merge request approval settings](../merge_requests/approvals/settings.md).
+
+### Approvals do not show
+
+Code Owner approval rules only update when the merge request is created.
+If you update the `CODEOWNERS` file, close the merge request and create a new one.
+
+### User not shown as possible approver
+
+A user might not show as an approver on the Code Owner merge request approval rules
+if any of these conditions are true:
+
+- A rule prevents the specific user from approving the merge request.
+  Check the project [merge request approval](../merge_requests/approvals/settings.md#edit-merge-request-approval-settings) settings.
+- A Code Owner group has a visibility of **private**, and the current user is not a
+  member of the Code Owner group.
+- Current user is an external user who does not have permission to the internal Code Owner group.
+
+### Approval rule is invalid
+
+You might get an error that states:
+
+```plaintext
+Approval rule is invalid.
+GitLab has approved this rule automatically to unblock the merge request.
+```
+
+This issue occurs when an approval rule uses a Code Owner that is not a direct member of the project.
+
+The workaround is to check that the group or user has been invited to the project.
+
+### User or group not shown when viewing Code Owners for a directory
+
+Code Owners might not show the intended user or group based on your configured rules when viewing a directory,
+but correctly show the Code Owners for files beneath the directory.
+
+For example:
+
+```plaintext
+* @dev-team
+docs/ @tech-writer-team
+```
+
+All files beneath the `docs/` directory show `@tech-writer-team` as Code Owners, but the directory itself will show `@dev-team`.
+
+This behavior occurs when viewing a directory because the [syntax rule](../../project/codeowners/reference.md#directory-paths)
+applies to all files beneath the directory, which does not include the directory itself. To resolve this, update the `CODEOWNERS` file to include the
+directory specifically along with all files beneath the directory. For example:
+
+```plaintext
+* @dev-team
+docs @tech-writer-team
+docs/ @tech-writer-team
+```

doc/user/project/codeowners/index.md

@@ -415,74 +415,3 @@ All changes from users _without_ the **Allowed to push** permission must be rout
 
 - [Syntax reference](reference.md)
 - [Development guidelines](../../../development/code_owners/index.md)
-
-## Troubleshooting
-
-When working with Code Owners, you might encounter the following issues.
-
-For more information about how the Code Owners feature handles errors, see the
-[Code Owners reference](reference.md).
-
-### Approvals shown as optional
-
-A Code Owner approval rule is optional if any of these conditions are true:
-
-- The user or group is not a member of the project.
-  Code Owners [cannot inherit members from parent groups](https://gitlab.com/gitlab-org/gitlab/-/issues/288851/).
-- [Code Owner approval on a protected branch](../protected_branches.md#require-code-owner-approval-on-a-protected-branch) has not been set up.
-- The section is [marked as optional](#make-a-code-owners-section-optional).
-- No eligible code owners are available to approve the merge request due to conflicts
-  with other [merge request approval settings](../merge_requests/approvals/settings.md).
-
-### Approvals do not show
-
-Code Owner approval rules only update when the merge request is created.
-If you update the `CODEOWNERS` file, close the merge request and create a new one.
-
-### User not shown as possible approver
-
-A user might not show as an approver on the Code Owner merge request approval rules
-if any of these conditions are true:
-
-- A rule prevents the specific user from approving the merge request.
-  Check the project [merge request approval](../merge_requests/approvals/settings.md#edit-merge-request-approval-settings) settings.
-- A Code Owner group has a visibility of **private**, and the current user is not a
-  member of the Code Owner group.
-- Current user is an external user who does not have permission to the internal Code Owner group.
-
-### Approval rule is invalid
-
-You might get an error that states:
-
-```plaintext
-Approval rule is invalid.
-GitLab has approved this rule automatically to unblock the merge request.
-```
-
-This issue occurs when an approval rule uses a Code Owner that is not a direct member of the project.
-
-The workaround is to check that the group or user has been invited to the project.
-
-### User or group not shown when viewing Code Owners for a directory
-
-Code Owners might not show the intended user or group based on your configured rules when viewing a directory,
-but correctly show the Code Owners for files beneath the directory.
-
-For example:
-
-```plaintext
-* @dev-team
-docs/ @tech-writer-team
-```
-
-All files beneath the `docs/` directory show `@tech-writer-team` as Code Owners, but the directory itself will show `@dev-team`.
-
-This behavior occurs when viewing a directory because the [syntax rule](../../project/codeowners/reference.md#directory-paths)
-applies to all files beneath the directory, which does not include the directory itself. To resolve this, update the `CODEOWNERS` file to include the
-directory specifically along with all files beneath the directory. For example:
-
-```plaintext
-* @dev-team
-docs @tech-writer-team
-docs/ @tech-writer-team
-```