Split documentation

docs/examples/customization/configuration-snippets/README.md

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+
+## Ingress
+The Ingress in this example adds a custom header to Nginx configuration that only applies to that specific Ingress. If you want to add headers that apply globally to all Ingresses, please have a look at [this example](/examples/customization/custom-headers/nginx).
+
+```console
+$ kubectl apply -f ingress.yaml
+```
+
+## Test
+
+Check if the contents of the annotation are present in the nginx.conf file using:
+`kubectl exec nginx-ingress-controller-873061567-4n3k2 -n kube-system cat /etc/nginx/nginx.conf`

docs/examples/customization/configuration-snippets/ingress.yaml

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+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: nginx-configuration-snippet
+  annotations:
+    kubernetes.io/ingress.class: "nginx"
+    ingress.kubernetes.io/configuration-snippet: |
+      more_set_headers "Request-Id: $request_id";
+
+spec:
+  rules:
+  - host: custom.configuration.com
+    http:
+      paths:
+      - backend:
+          serviceName: http-svc
+          servicePort: 80
+        path: /