Update site/content/configuration/global-configuration/configmap-resource.md

Signed-off-by: Alan Dooley <[email protected]>

Author: ADubhlaoich

site/content/configuration/global-configuration/configmap-resource.md

@@ -192,8 +192,6 @@ You will also need to manually add the headless service, such as in [this exampl
 If you previously installed OIDC or used the `zone_sync` directive with `stream-snippets` in [v4.0.1](https://github.com/nginx/kubernetes-ingress/tree/v4.0.1) or earlier, and you plan to enable the `zone-sync` ConfigMap key, the `zone_sync` directive should be removed from `stream-snippets`. 
 
 If you encounter the error `error [emerg] 13#13: "zone_sync" directive is duplicate in /etc/nginx/nginx.conf:164` it is likely due to `zone_sync` being enabled in both `stream-snippets` and the ConfigMap. Once upgraded, remove the [old headless service](https://github.com/nginx/kubernetes-ingress/blob/v4.0.1/examples/custom-resources/oidc/nginx-ingress-headless.yaml) deployed for OIDC.
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