chore: Update discovery artifacts (#1317)

## Discovery Artifact Change Summary:
contentv2[ [More details]](https://github.com/googleapis/google-api-python-client/commit/85dcfe41b40f6827345fadfcccfc78f31a872e4a)
contentv21[ [More details]](https://github.com/googleapis/google-api-python-client/commit/85dcfe41b40f6827345fadfcccfc78f31a872e4a)
dnsv1beta2[ [More details]](https://github.com/googleapis/google-api-python-client/commit/5dfd888f6af29ce3bd1589683cc22255acf971c5)
realtimebiddingv1alpha[ [More details]](https://github.com/googleapis/google-api-python-client/commit/26dc108c295c1d1ab93ee13bc70f4802c4d60d2d)
serviceconsumermanagementv1[ [More details]](https://github.com/googleapis/google-api-python-client/commit/736e39a686d43af2c49e3442066ec2cb78642792)
serviceconsumermanagementv1beta1[ [More details]](https://github.com/googleapis/google-api-python-client/commit/736e39a686d43af2c49e3442066ec2cb78642792)
servicemanagementv1[ [More details]](https://github.com/googleapis/google-api-python-client/commit/d34c2fed6e96f74b355a22c8a0fd2f0bf73898ec)
servicenetworkingv1[ [More details]](https://github.com/googleapis/google-api-python-client/commit/67d9d5d8392b86cb004dc340884227a42b2ff06f)
servicenetworkingv1beta[ [More details]](https://github.com/googleapis/google-api-python-client/commit/67d9d5d8392b86cb004dc340884227a42b2ff06f)
serviceusagev1[ [More details]](https://github.com/googleapis/google-api-python-client/commit/833c6db32348fc0c6e483710a0de4d5048c3fbae)
serviceusagev1beta1[ [More details]](https://github.com/googleapis/google-api-python-client/commit/833c6db32348fc0c6e483710a0de4d5048c3fbae)
diff --git a/docs/dyn/dns_v1beta2.managedZones.html b/docs/dyn/dns_v1beta2.managedZones.html
index ec5bd68..7d0e058 100644
--- a/docs/dyn/dns_v1beta2.managedZones.html
+++ b/docs/dyn/dns_v1beta2.managedZones.html
@@ -160,6 +160,12 @@
     },
   },
   "privateVisibilityConfig": { # For privately visible zones, the set of Virtual Private Cloud resources that the zone is visible from.
+    "gkeClusters": [ # The list of Google Kubernetes Engine clusters that can see this zone.
+      {
+        "gkeClusterName": "A String", # The resource name of the cluster to bind this ManagedZone to. This should be specified in the format like: projects/*/locations/*/clusters/*. This is referenced from GKE projects.locations.clusters.get API: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/projects.locations.clusters/get
+        "kind": "dns#managedZonePrivateVisibilityConfigGKECluster",
+      },
+    ],
     "kind": "dns#managedZonePrivateVisibilityConfig",
     "networks": [ # The list of VPC networks that can see this zone.
       {
@@ -238,6 +244,12 @@
     },
   },
   "privateVisibilityConfig": { # For privately visible zones, the set of Virtual Private Cloud resources that the zone is visible from.
+    "gkeClusters": [ # The list of Google Kubernetes Engine clusters that can see this zone.
+      {
+        "gkeClusterName": "A String", # The resource name of the cluster to bind this ManagedZone to. This should be specified in the format like: projects/*/locations/*/clusters/*. This is referenced from GKE projects.locations.clusters.get API: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/projects.locations.clusters/get
+        "kind": "dns#managedZonePrivateVisibilityConfigGKECluster",
+      },
+    ],
     "kind": "dns#managedZonePrivateVisibilityConfig",
     "networks": [ # The list of VPC networks that can see this zone.
       {
@@ -339,6 +351,12 @@
     },
   },
   "privateVisibilityConfig": { # For privately visible zones, the set of Virtual Private Cloud resources that the zone is visible from.
+    "gkeClusters": [ # The list of Google Kubernetes Engine clusters that can see this zone.
+      {
+        "gkeClusterName": "A String", # The resource name of the cluster to bind this ManagedZone to. This should be specified in the format like: projects/*/locations/*/clusters/*. This is referenced from GKE projects.locations.clusters.get API: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/projects.locations.clusters/get
+        "kind": "dns#managedZonePrivateVisibilityConfigGKECluster",
+      },
+    ],
     "kind": "dns#managedZonePrivateVisibilityConfig",
     "networks": [ # The list of VPC networks that can see this zone.
       {
@@ -432,6 +450,12 @@
         },
       },
       "privateVisibilityConfig": { # For privately visible zones, the set of Virtual Private Cloud resources that the zone is visible from.
+        "gkeClusters": [ # The list of Google Kubernetes Engine clusters that can see this zone.
+          {
+            "gkeClusterName": "A String", # The resource name of the cluster to bind this ManagedZone to. This should be specified in the format like: projects/*/locations/*/clusters/*. This is referenced from GKE projects.locations.clusters.get API: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/projects.locations.clusters/get
+            "kind": "dns#managedZonePrivateVisibilityConfigGKECluster",
+          },
+        ],
         "kind": "dns#managedZonePrivateVisibilityConfig",
         "networks": [ # The list of VPC networks that can see this zone.
           {
@@ -529,6 +553,12 @@
     },
   },
   "privateVisibilityConfig": { # For privately visible zones, the set of Virtual Private Cloud resources that the zone is visible from.
+    "gkeClusters": [ # The list of Google Kubernetes Engine clusters that can see this zone.
+      {
+        "gkeClusterName": "A String", # The resource name of the cluster to bind this ManagedZone to. This should be specified in the format like: projects/*/locations/*/clusters/*. This is referenced from GKE projects.locations.clusters.get API: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/projects.locations.clusters/get
+        "kind": "dns#managedZonePrivateVisibilityConfigGKECluster",
+      },
+    ],
     "kind": "dns#managedZonePrivateVisibilityConfig",
     "networks": [ # The list of VPC networks that can see this zone.
       {
@@ -653,6 +683,12 @@
         },
       },
       "privateVisibilityConfig": { # For privately visible zones, the set of Virtual Private Cloud resources that the zone is visible from.
+        "gkeClusters": [ # The list of Google Kubernetes Engine clusters that can see this zone.
+          {
+            "gkeClusterName": "A String", # The resource name of the cluster to bind this ManagedZone to. This should be specified in the format like: projects/*/locations/*/clusters/*. This is referenced from GKE projects.locations.clusters.get API: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/projects.locations.clusters/get
+            "kind": "dns#managedZonePrivateVisibilityConfigGKECluster",
+          },
+        ],
         "kind": "dns#managedZonePrivateVisibilityConfig",
         "networks": [ # The list of VPC networks that can see this zone.
           {
@@ -721,6 +757,12 @@
         },
       },
       "privateVisibilityConfig": { # For privately visible zones, the set of Virtual Private Cloud resources that the zone is visible from.
+        "gkeClusters": [ # The list of Google Kubernetes Engine clusters that can see this zone.
+          {
+            "gkeClusterName": "A String", # The resource name of the cluster to bind this ManagedZone to. This should be specified in the format like: projects/*/locations/*/clusters/*. This is referenced from GKE projects.locations.clusters.get API: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/projects.locations.clusters/get
+            "kind": "dns#managedZonePrivateVisibilityConfigGKECluster",
+          },
+        ],
         "kind": "dns#managedZonePrivateVisibilityConfig",
         "networks": [ # The list of VPC networks that can see this zone.
           {
@@ -803,6 +845,12 @@
     },
   },
   "privateVisibilityConfig": { # For privately visible zones, the set of Virtual Private Cloud resources that the zone is visible from.
+    "gkeClusters": [ # The list of Google Kubernetes Engine clusters that can see this zone.
+      {
+        "gkeClusterName": "A String", # The resource name of the cluster to bind this ManagedZone to. This should be specified in the format like: projects/*/locations/*/clusters/*. This is referenced from GKE projects.locations.clusters.get API: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/projects.locations.clusters/get
+        "kind": "dns#managedZonePrivateVisibilityConfigGKECluster",
+      },
+    ],
     "kind": "dns#managedZonePrivateVisibilityConfig",
     "networks": [ # The list of VPC networks that can see this zone.
       {
@@ -927,6 +975,12 @@
         },
       },
       "privateVisibilityConfig": { # For privately visible zones, the set of Virtual Private Cloud resources that the zone is visible from.
+        "gkeClusters": [ # The list of Google Kubernetes Engine clusters that can see this zone.
+          {
+            "gkeClusterName": "A String", # The resource name of the cluster to bind this ManagedZone to. This should be specified in the format like: projects/*/locations/*/clusters/*. This is referenced from GKE projects.locations.clusters.get API: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/projects.locations.clusters/get
+            "kind": "dns#managedZonePrivateVisibilityConfigGKECluster",
+          },
+        ],
         "kind": "dns#managedZonePrivateVisibilityConfig",
         "networks": [ # The list of VPC networks that can see this zone.
           {
@@ -995,6 +1049,12 @@
         },
       },
       "privateVisibilityConfig": { # For privately visible zones, the set of Virtual Private Cloud resources that the zone is visible from.
+        "gkeClusters": [ # The list of Google Kubernetes Engine clusters that can see this zone.
+          {
+            "gkeClusterName": "A String", # The resource name of the cluster to bind this ManagedZone to. This should be specified in the format like: projects/*/locations/*/clusters/*. This is referenced from GKE projects.locations.clusters.get API: https://cloud.google.com/kubernetes-engine/docs/reference/rest/v1/projects.locations.clusters/get
+            "kind": "dns#managedZonePrivateVisibilityConfigGKECluster",
+          },
+        ],
         "kind": "dns#managedZonePrivateVisibilityConfig",
         "networks": [ # The list of VPC networks that can see this zone.
           {