Add docs-zh-approvers to CODEOWNERS (#4522)

Signed-off-by: svrnm <neumanns@cisco.com>

Author: svrnm

.github/CODEOWNERS

@@ -42,3 +42,4 @@ content/en/docs/specs/                   @open-telemetry/docs-approvers @open-te
 content/en/docs/security/                @open-telemetry/docs-approvers @open-telemetry/sig-security-maintainers
 content/en/ecosystem/demo/               @open-telemetry/demo-approvers @open-telemetry/demo-approvers
 content/en/docs/contributing/       @open-telemetry/docs-approvers @open-telemetry/docs-maintainers
+content/zh/                         @open-telemetry/docs-zh-approvers