docs: Update trafficDistribution field

Author: younsl

helm/oauth2-proxy/README.md

@@ -203,6 +203,7 @@ The following table lists the configurable parameters of the oauth2-proxy chart
 | `service.ipDualStack.enabled`                         | enable IPv4/IPv6 dual-stack for the service                                                                                                                                                                                                                      | `false`                                                                                              |
 | `service.ipDualStack.ipFamilies`                      | ip families for the service if IPv4/IPv6 dual-stack is enabled                                                                                                                                                                                                   | `["IPv6", "IPv4"]`                                                                                   |
 | `service.ipDualStack.ipFamilyPolicy`                  | ip family policy for the service if IPv4/IPv6 dual-stack is enabled                                                                                                                                                                                              | `"PreferDualStack"`                                                                                  |
+| `service.trafficDistribution`                         | traffic distribution policy for the service. See [Kubernetes docs](https://kubernetes.io/docs/concepts/services-networking/service/#traffic-distribution)                                                                                                        | `""`                                                                                                 |
 | `serviceAccount.enabled`                              | create a service account                                                                                                                                                                                                                                         | `true`                                                                                               |
 | `serviceAccount.name`                                 | the service account name                                                                                                                                                                                                                                         | ``                                                                                                   |
 | `serviceAccount.annotations`                          | (optional) annotations for the service account                                                                                                                                                                                                                   | `{}`                                                                                                 |