CODEOWNERS: add docs-maintainers to zh folder for now (#4584)

Co-authored-by: Severin Neumann <[email protected]>

Author: chalin

.github/CODEOWNERS

@@ -45,4 +45,4 @@ content/en/docs/zero-code/java/          @open-telemetry/docs-approvers @open-te
 content/en/docs/zero-code/js/            @open-telemetry/docs-approvers @open-telemetry/javascript-approvers
 content/en/docs/zero-code/net/           @open-telemetry/docs-approvers @open-telemetry/dotnet-approvers @open-telemetry/dotnet-instrumentation-approvers
 content/en/ecosystem/demo/               @open-telemetry/demo-approvers @open-telemetry/demo-approvers
-content/zh/                              @open-telemetry/docs-zh-approvers
+content/zh/                              @open-telemetry/docs-maintainers @open-telemetry/docs-zh-approvers