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.responsePolicies.html b/docs/dyn/dns_v1beta2.responsePolicies.html
index fc7383a..2ec8068 100644
--- a/docs/dyn/dns_v1beta2.responsePolicies.html
+++ b/docs/dyn/dns_v1beta2.responsePolicies.html
@@ -115,6 +115,12 @@
 
 { # A Response Policy is a collection of selectors that apply to queries made against one or more Virtual Private Cloud networks.
   "description": "A String", # User-provided description for this Response Policy.
+  "gkeClusters": [ # The list of Google Kubernetes Engine clusters to which this response policy is applied.
+    {
+      "gkeClusterName": "A String", # The resource name of the cluster to bind this response policy 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#responsePolicyGKECluster",
+    },
+  ],
   "id": "A String", # Unique identifier for the resource; defined by the server (output only).
   "kind": "dns#responsePolicy",
   "networks": [ # List of network names specifying networks to which this policy is applied.
@@ -137,6 +143,12 @@
 
     { # A Response Policy is a collection of selectors that apply to queries made against one or more Virtual Private Cloud networks.
   "description": "A String", # User-provided description for this Response Policy.
+  "gkeClusters": [ # The list of Google Kubernetes Engine clusters to which this response policy is applied.
+    {
+      "gkeClusterName": "A String", # The resource name of the cluster to bind this response policy 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#responsePolicyGKECluster",
+    },
+  ],
   "id": "A String", # Unique identifier for the resource; defined by the server (output only).
   "kind": "dns#responsePolicy",
   "networks": [ # List of network names specifying networks to which this policy is applied.
@@ -182,6 +194,12 @@
 
     { # A Response Policy is a collection of selectors that apply to queries made against one or more Virtual Private Cloud networks.
   "description": "A String", # User-provided description for this Response Policy.
+  "gkeClusters": [ # The list of Google Kubernetes Engine clusters to which this response policy is applied.
+    {
+      "gkeClusterName": "A String", # The resource name of the cluster to bind this response policy 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#responsePolicyGKECluster",
+    },
+  ],
   "id": "A String", # Unique identifier for the resource; defined by the server (output only).
   "kind": "dns#responsePolicy",
   "networks": [ # List of network names specifying networks to which this policy is applied.
@@ -218,6 +236,12 @@
   "responsePolicies": [ # The Response Policy resources.
     { # A Response Policy is a collection of selectors that apply to queries made against one or more Virtual Private Cloud networks.
       "description": "A String", # User-provided description for this Response Policy.
+      "gkeClusters": [ # The list of Google Kubernetes Engine clusters to which this response policy is applied.
+        {
+          "gkeClusterName": "A String", # The resource name of the cluster to bind this response policy 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#responsePolicyGKECluster",
+        },
+      ],
       "id": "A String", # Unique identifier for the resource; defined by the server (output only).
       "kind": "dns#responsePolicy",
       "networks": [ # List of network names specifying networks to which this policy is applied.
@@ -258,6 +282,12 @@
 
 { # A Response Policy is a collection of selectors that apply to queries made against one or more Virtual Private Cloud networks.
   "description": "A String", # User-provided description for this Response Policy.
+  "gkeClusters": [ # The list of Google Kubernetes Engine clusters to which this response policy is applied.
+    {
+      "gkeClusterName": "A String", # The resource name of the cluster to bind this response policy 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#responsePolicyGKECluster",
+    },
+  ],
   "id": "A String", # Unique identifier for the resource; defined by the server (output only).
   "kind": "dns#responsePolicy",
   "networks": [ # List of network names specifying networks to which this policy is applied.
@@ -284,6 +314,12 @@
   },
   "responsePolicy": { # A Response Policy is a collection of selectors that apply to queries made against one or more Virtual Private Cloud networks.
     "description": "A String", # User-provided description for this Response Policy.
+    "gkeClusters": [ # The list of Google Kubernetes Engine clusters to which this response policy is applied.
+      {
+        "gkeClusterName": "A String", # The resource name of the cluster to bind this response policy 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#responsePolicyGKECluster",
+      },
+    ],
     "id": "A String", # Unique identifier for the resource; defined by the server (output only).
     "kind": "dns#responsePolicy",
     "networks": [ # List of network names specifying networks to which this policy is applied.
@@ -309,6 +345,12 @@
 
 { # A Response Policy is a collection of selectors that apply to queries made against one or more Virtual Private Cloud networks.
   "description": "A String", # User-provided description for this Response Policy.
+  "gkeClusters": [ # The list of Google Kubernetes Engine clusters to which this response policy is applied.
+    {
+      "gkeClusterName": "A String", # The resource name of the cluster to bind this response policy 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#responsePolicyGKECluster",
+    },
+  ],
   "id": "A String", # Unique identifier for the resource; defined by the server (output only).
   "kind": "dns#responsePolicy",
   "networks": [ # List of network names specifying networks to which this policy is applied.
@@ -335,6 +377,12 @@
   },
   "responsePolicy": { # A Response Policy is a collection of selectors that apply to queries made against one or more Virtual Private Cloud networks.
     "description": "A String", # User-provided description for this Response Policy.
+    "gkeClusters": [ # The list of Google Kubernetes Engine clusters to which this response policy is applied.
+      {
+        "gkeClusterName": "A String", # The resource name of the cluster to bind this response policy 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#responsePolicyGKECluster",
+      },
+    ],
     "id": "A String", # Unique identifier for the resource; defined by the server (output only).
     "kind": "dns#responsePolicy",
     "networks": [ # List of network names specifying networks to which this policy is applied.