docs: Code Editor - update header content example

[kmcfaul]

"With shortcut menu and main header content" example for Code Editor does not actually pass any header content in, and should be updated to have content.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity.