chore: Update discovery artifacts (#1425)

## Deleted keys were detected in the following stable discovery artifacts:
admin directory_v1 https://github.com/googleapis/google-api-python-client/commit/1534f8926019f43dc87a29c1ca32191884556e3b
bigquery v2 https://github.com/googleapis/google-api-python-client/commit/59c51e319602741632201d2ce61a6b03f13e4003
file v1 https://github.com/googleapis/google-api-python-client/commit/0cd409a2d15c68aca3ea864400fc4772b9b4e503
memcache v1 https://github.com/googleapis/google-api-python-client/commit/665ce5b47b9b3238dcfa201b9343bf6447df5994
youtube v3 https://github.com/googleapis/google-api-python-client/commit/5046950872559fe93b954dc9a4f71fd724176247

## Deleted keys were detected in the following pre-stable discovery artifacts:
analyticsadmin v1alpha https://github.com/googleapis/google-api-python-client/commit/934358e5c041ffd1449e7c744463e61e94381ed5
documentai v1beta3 https://github.com/googleapis/google-api-python-client/commit/e8aaabbc7670aefc4a745916fccb31424745f748
file v1beta1 https://github.com/googleapis/google-api-python-client/commit/0cd409a2d15c68aca3ea864400fc4772b9b4e503
memcache v1beta2 https://github.com/googleapis/google-api-python-client/commit/665ce5b47b9b3238dcfa201b9343bf6447df5994
networkconnectivity v1alpha1 https://github.com/googleapis/google-api-python-client/commit/2cc462638aec61f4e775bfce883e725b104eeabb

## Discovery Artifact Change Summary:
feat(admin): update the api https://github.com/googleapis/google-api-python-client/commit/1534f8926019f43dc87a29c1ca32191884556e3b
feat(alertcenter): update the api https://github.com/googleapis/google-api-python-client/commit/7a488d3f0deef3e1f106cff63b1e4f66ad1727bb
feat(analyticsadmin): update the api https://github.com/googleapis/google-api-python-client/commit/934358e5c041ffd1449e7c744463e61e94381ed5
feat(analyticsdata): update the api https://github.com/googleapis/google-api-python-client/commit/40f712130674cec09c1dd7560f69a330a335b226
feat(androiddeviceprovisioning): update the api https://github.com/googleapis/google-api-python-client/commit/81a0002a7051aeab647a3296fb18ce7973bf7137
feat(apigee): update the api https://github.com/googleapis/google-api-python-client/commit/2e6c78a93b2c0ee7001eb163ec95f9afc8f35575
feat(appengine): update the api https://github.com/googleapis/google-api-python-client/commit/125f74a61a94af17c01930841a79db46d3a059c5
feat(bigquery): update the api https://github.com/googleapis/google-api-python-client/commit/59c51e319602741632201d2ce61a6b03f13e4003
feat(cloudasset): update the api https://github.com/googleapis/google-api-python-client/commit/e615264971ccee6eb9b450fe3d85614209c0fee8
feat(cloudbuild): update the api https://github.com/googleapis/google-api-python-client/commit/ceddaccf23eb8b809688907cfdef8906cd77d65d
feat(cloudidentity): update the api https://github.com/googleapis/google-api-python-client/commit/22cd08b69b034c2cdfd854e1ac784f834539db3a
feat(container): update the api https://github.com/googleapis/google-api-python-client/commit/f494c63a42dc418559292c6269289317d9cebc23
feat(documentai): update the api https://github.com/googleapis/google-api-python-client/commit/e8aaabbc7670aefc4a745916fccb31424745f748
feat(drive): update the api https://github.com/googleapis/google-api-python-client/commit/72cab88ce591d906ea1cfcbe4dee354cccb623f2
feat(file): update the api https://github.com/googleapis/google-api-python-client/commit/0cd409a2d15c68aca3ea864400fc4772b9b4e503
feat(firebaseappcheck): update the api https://github.com/googleapis/google-api-python-client/commit/9a0131b2326327109d1ba7af97b1f4808dd7a898
feat(healthcare): update the api https://github.com/googleapis/google-api-python-client/commit/45ee6b28b86a43f44c707e15a7e06fdf8fce6a0f
feat(ideahub): update the api https://github.com/googleapis/google-api-python-client/commit/73b86d9d37f33aeaed74772d0319ba1350e54ed5
feat(managedidentities): update the api https://github.com/googleapis/google-api-python-client/commit/a07ed4558c93cb8f7fae49c7b353f46ccfea6c10
feat(memcache): update the api https://github.com/googleapis/google-api-python-client/commit/665ce5b47b9b3238dcfa201b9343bf6447df5994
feat(metastore): update the api https://github.com/googleapis/google-api-python-client/commit/9fd5ffbf37fb052323f5fa68d307c68391c519ac
feat(ml): update the api https://github.com/googleapis/google-api-python-client/commit/cf54d564915a558569c093287b448a7819e215f6
feat(monitoring): update the api https://github.com/googleapis/google-api-python-client/commit/d1ffbfc041f23f904cd8bc35a450871b2909473b
feat(networkconnectivity): update the api https://github.com/googleapis/google-api-python-client/commit/2cc462638aec61f4e775bfce883e725b104eeabb
feat(notebooks): update the api https://github.com/googleapis/google-api-python-client/commit/831ba938855aa4bdefafedf63e01af43350e7ed2
feat(ondemandscanning): update the api https://github.com/googleapis/google-api-python-client/commit/c04b4023477393cbb41984b14e0c734fc8587d45
feat(paymentsresellersubscription): update the api https://github.com/googleapis/google-api-python-client/commit/2cd5b1c2ef524f3ab00630508710cce7bee53574
feat(prod_tt_sasportal): update the api https://github.com/googleapis/google-api-python-client/commit/8b6bd24e57a79f470c750ad04052f79a3cafe0fa
feat(realtimebidding): update the api https://github.com/googleapis/google-api-python-client/commit/fd514dc8d86182dc17698f3293144928535f709c
feat(reseller): update the api https://github.com/googleapis/google-api-python-client/commit/20226c4401956732772e2a563c7920666135e605
feat(sasportal): update the api https://github.com/googleapis/google-api-python-client/commit/38d5156350b79a9933b2806f4bbe443043a33185
feat(sts): update the api https://github.com/googleapis/google-api-python-client/commit/190e13ebe5a4660d8825d3a8708559077a342bdf
feat(transcoder): update the api https://github.com/googleapis/google-api-python-client/commit/fbcacce6a17c1cae45b22f4a2058e730ec84b55a
feat(youtube): update the api https://github.com/googleapis/google-api-python-client/commit/5046950872559fe93b954dc9a4f71fd724176247
diff --git a/docs/dyn/compute_alpha.disks.html b/docs/dyn/compute_alpha.disks.html
index acbb461..07fa449 100644
--- a/docs/dyn/compute_alpha.disks.html
+++ b/docs/dyn/compute_alpha.disks.html
@@ -138,7 +138,7 @@
     The object takes the form of:
 
 {
-  "resourcePolicies": [ # Resource policies to be added to this disk. Currently you can only specify one policy here.
+  "resourcePolicies": [ # Full or relative path to the resource policy to be added to this disk. You can only specify one resource policy.
     "A String",
   ],
 }
@@ -261,7 +261,7 @@
           "name": "A String", # Name of the resource. Provided by the client when the resource is created. The name must be 1-63 characters long, and comply with RFC1035. Specifically, the name must be 1-63 characters long and match the regular expression `[a-z]([-a-z0-9]*[a-z0-9])?` which means the first character must be a lowercase letter, and all following characters must be a dash, lowercase letter, or digit, except the last character, which cannot be a dash.
           "options": "A String", # Internal use only.
           "physicalBlockSizeBytes": "A String", # Physical block size of the persistent disk, in bytes. If not present in a request, a default value is used. The currently supported size is 4096, other sizes may be added in the future. If an unsupported value is requested, the error message will list the supported values for the caller's project.
-          "provisionedIops": "A String", # Indicates how many IOPS must be provisioned for the disk.
+          "provisionedIops": "A String", # Indicates how many IOPS to provision for the disk. This sets the number of I/O operations per second that the disk can handle. Values must be between 10,000 and 120,000. For more details, see the Extreme persistent disk documentation.
           "region": "A String", # [Output Only] URL of the region where the disk resides. Only applicable for regional resources. You must specify this field as part of the HTTP request URL. It is not settable as a field in the request body.
           "replicaZones": [ # URLs of the zones where the disk should be replicated to. Only applicable for regional resources.
             "A String",
@@ -300,7 +300,7 @@
           "sourceStorageObject": "A String", # The full Google Cloud Storage URI where the disk image is stored. This file must be a gzip-compressed tarball whose name ends in .tar.gz or virtual machine disk whose name ends in vmdk. Valid URIs may start with gs:// or https://storage.googleapis.com/. This flag is not optimized for creating multiple disks from a source storage object. To create many disks from a source storage object, use gcloud compute images import instead.
           "status": "A String", # [Output Only] The status of disk creation. - CREATING: Disk is provisioning. - RESTORING: Source data is being copied into the disk. - FAILED: Disk creation failed. - READY: Disk is ready for use. - DELETING: Disk is deleting.
           "storageType": "A String", # [Deprecated] Storage type of the persistent disk.
-          "type": "A String", # URL of the disk type resource describing which disk type to use to create the disk. Provide this when creating the disk. For example: projects/project /zones/zone/diskTypes/pd-standard or pd-ssd
+          "type": "A String", # URL of the disk type resource describing which disk type to use to create the disk. Provide this when creating the disk. For example: projects/project /zones/zone/diskTypes/pd-ssd . See Persistent disk types.
           "userLicenses": [ # A list of publicly visible user-licenses. Unlike regular licenses, user provided licenses can be modified after the disk is created. This includes a list of URLs to the license resource. For example, to provide a debian license: https://www.googleapis.com/compute/v1/projects/debian-cloud/global/licenses/debian-9-stretch
             "A String",
           ],
@@ -417,6 +417,8 @@
     "sha256": "A String", # [Output only] The RFC 4648 base64 encoded SHA-256 hash of the customer-supplied encryption key that protects this resource.
   },
   "sourceDiskId": "A String", # [Output Only] The ID value of the disk used to create this snapshot. This value may be used to determine whether the snapshot was taken from the current or a previous instance of a given disk name.
+  "sourceInstantSnapshot": "A String", # The source instant snapshot used to create this snapshot. You can provide this as a partial or full URL to the resource. For example, the following are valid values: - https://www.googleapis.com/compute/v1/projects/project/zones/zone /instantSnapshots/instantSnapshot - projects/project/zones/zone/instantSnapshots/instantSnapshot - zones/zone/instantSnapshots/instantSnapshot
+  "sourceInstantSnapshotId": "A String", # [Output Only] The unique ID of the instant snapshot used to create this snapshot. This value identifies the exact instant snapshot that was used to create this persistent disk. For example, if you created the persistent disk from an instant snapshot that was later deleted and recreated under the same name, the source instant snapshot ID would identify the exact instant snapshot that was used.
   "status": "A String", # [Output Only] The status of the snapshot. This can be CREATING, DELETING, FAILED, READY, or UPLOADING.
   "storageBytes": "A String", # [Output Only] A size of the storage used by the snapshot. As snapshots share storage, this number is expected to change with snapshot creation/deletion.
   "storageBytesStatus": "A String", # [Output Only] An indicator whether storageBytes is in a stable state or it is being adjusted as a result of shared storage reallocation. This status can either be UPDATING, meaning the size of the snapshot is being updated, or UP_TO_DATE, meaning the size of the snapshot is up-to-date.
@@ -600,7 +602,7 @@
   "name": "A String", # Name of the resource. Provided by the client when the resource is created. The name must be 1-63 characters long, and comply with RFC1035. Specifically, the name must be 1-63 characters long and match the regular expression `[a-z]([-a-z0-9]*[a-z0-9])?` which means the first character must be a lowercase letter, and all following characters must be a dash, lowercase letter, or digit, except the last character, which cannot be a dash.
   "options": "A String", # Internal use only.
   "physicalBlockSizeBytes": "A String", # Physical block size of the persistent disk, in bytes. If not present in a request, a default value is used. The currently supported size is 4096, other sizes may be added in the future. If an unsupported value is requested, the error message will list the supported values for the caller's project.
-  "provisionedIops": "A String", # Indicates how many IOPS must be provisioned for the disk.
+  "provisionedIops": "A String", # Indicates how many IOPS to provision for the disk. This sets the number of I/O operations per second that the disk can handle. Values must be between 10,000 and 120,000. For more details, see the Extreme persistent disk documentation.
   "region": "A String", # [Output Only] URL of the region where the disk resides. Only applicable for regional resources. You must specify this field as part of the HTTP request URL. It is not settable as a field in the request body.
   "replicaZones": [ # URLs of the zones where the disk should be replicated to. Only applicable for regional resources.
     "A String",
@@ -639,7 +641,7 @@
   "sourceStorageObject": "A String", # The full Google Cloud Storage URI where the disk image is stored. This file must be a gzip-compressed tarball whose name ends in .tar.gz or virtual machine disk whose name ends in vmdk. Valid URIs may start with gs:// or https://storage.googleapis.com/. This flag is not optimized for creating multiple disks from a source storage object. To create many disks from a source storage object, use gcloud compute images import instead.
   "status": "A String", # [Output Only] The status of disk creation. - CREATING: Disk is provisioning. - RESTORING: Source data is being copied into the disk. - FAILED: Disk creation failed. - READY: Disk is ready for use. - DELETING: Disk is deleting.
   "storageType": "A String", # [Deprecated] Storage type of the persistent disk.
-  "type": "A String", # URL of the disk type resource describing which disk type to use to create the disk. Provide this when creating the disk. For example: projects/project /zones/zone/diskTypes/pd-standard or pd-ssd
+  "type": "A String", # URL of the disk type resource describing which disk type to use to create the disk. Provide this when creating the disk. For example: projects/project /zones/zone/diskTypes/pd-ssd . See Persistent disk types.
   "userLicenses": [ # A list of publicly visible user-licenses. Unlike regular licenses, user provided licenses can be modified after the disk is created. This includes a list of URLs to the license resource. For example, to provide a debian license: https://www.googleapis.com/compute/v1/projects/debian-cloud/global/licenses/debian-9-stretch
     "A String",
   ],
@@ -801,7 +803,7 @@
   "name": "A String", # Name of the resource. Provided by the client when the resource is created. The name must be 1-63 characters long, and comply with RFC1035. Specifically, the name must be 1-63 characters long and match the regular expression `[a-z]([-a-z0-9]*[a-z0-9])?` which means the first character must be a lowercase letter, and all following characters must be a dash, lowercase letter, or digit, except the last character, which cannot be a dash.
   "options": "A String", # Internal use only.
   "physicalBlockSizeBytes": "A String", # Physical block size of the persistent disk, in bytes. If not present in a request, a default value is used. The currently supported size is 4096, other sizes may be added in the future. If an unsupported value is requested, the error message will list the supported values for the caller's project.
-  "provisionedIops": "A String", # Indicates how many IOPS must be provisioned for the disk.
+  "provisionedIops": "A String", # Indicates how many IOPS to provision for the disk. This sets the number of I/O operations per second that the disk can handle. Values must be between 10,000 and 120,000. For more details, see the Extreme persistent disk documentation.
   "region": "A String", # [Output Only] URL of the region where the disk resides. Only applicable for regional resources. You must specify this field as part of the HTTP request URL. It is not settable as a field in the request body.
   "replicaZones": [ # URLs of the zones where the disk should be replicated to. Only applicable for regional resources.
     "A String",
@@ -840,7 +842,7 @@
   "sourceStorageObject": "A String", # The full Google Cloud Storage URI where the disk image is stored. This file must be a gzip-compressed tarball whose name ends in .tar.gz or virtual machine disk whose name ends in vmdk. Valid URIs may start with gs:// or https://storage.googleapis.com/. This flag is not optimized for creating multiple disks from a source storage object. To create many disks from a source storage object, use gcloud compute images import instead.
   "status": "A String", # [Output Only] The status of disk creation. - CREATING: Disk is provisioning. - RESTORING: Source data is being copied into the disk. - FAILED: Disk creation failed. - READY: Disk is ready for use. - DELETING: Disk is deleting.
   "storageType": "A String", # [Deprecated] Storage type of the persistent disk.
-  "type": "A String", # URL of the disk type resource describing which disk type to use to create the disk. Provide this when creating the disk. For example: projects/project /zones/zone/diskTypes/pd-standard or pd-ssd
+  "type": "A String", # URL of the disk type resource describing which disk type to use to create the disk. Provide this when creating the disk. For example: projects/project /zones/zone/diskTypes/pd-ssd . See Persistent disk types.
   "userLicenses": [ # A list of publicly visible user-licenses. Unlike regular licenses, user provided licenses can be modified after the disk is created. This includes a list of URLs to the license resource. For example, to provide a debian license: https://www.googleapis.com/compute/v1/projects/debian-cloud/global/licenses/debian-9-stretch
     "A String",
   ],
@@ -967,7 +969,7 @@
       "name": "A String", # Name of the resource. Provided by the client when the resource is created. The name must be 1-63 characters long, and comply with RFC1035. Specifically, the name must be 1-63 characters long and match the regular expression `[a-z]([-a-z0-9]*[a-z0-9])?` which means the first character must be a lowercase letter, and all following characters must be a dash, lowercase letter, or digit, except the last character, which cannot be a dash.
       "options": "A String", # Internal use only.
       "physicalBlockSizeBytes": "A String", # Physical block size of the persistent disk, in bytes. If not present in a request, a default value is used. The currently supported size is 4096, other sizes may be added in the future. If an unsupported value is requested, the error message will list the supported values for the caller's project.
-      "provisionedIops": "A String", # Indicates how many IOPS must be provisioned for the disk.
+      "provisionedIops": "A String", # Indicates how many IOPS to provision for the disk. This sets the number of I/O operations per second that the disk can handle. Values must be between 10,000 and 120,000. For more details, see the Extreme persistent disk documentation.
       "region": "A String", # [Output Only] URL of the region where the disk resides. Only applicable for regional resources. You must specify this field as part of the HTTP request URL. It is not settable as a field in the request body.
       "replicaZones": [ # URLs of the zones where the disk should be replicated to. Only applicable for regional resources.
         "A String",
@@ -1006,7 +1008,7 @@
       "sourceStorageObject": "A String", # The full Google Cloud Storage URI where the disk image is stored. This file must be a gzip-compressed tarball whose name ends in .tar.gz or virtual machine disk whose name ends in vmdk. Valid URIs may start with gs:// or https://storage.googleapis.com/. This flag is not optimized for creating multiple disks from a source storage object. To create many disks from a source storage object, use gcloud compute images import instead.
       "status": "A String", # [Output Only] The status of disk creation. - CREATING: Disk is provisioning. - RESTORING: Source data is being copied into the disk. - FAILED: Disk creation failed. - READY: Disk is ready for use. - DELETING: Disk is deleting.
       "storageType": "A String", # [Deprecated] Storage type of the persistent disk.
-      "type": "A String", # URL of the disk type resource describing which disk type to use to create the disk. Provide this when creating the disk. For example: projects/project /zones/zone/diskTypes/pd-standard or pd-ssd
+      "type": "A String", # URL of the disk type resource describing which disk type to use to create the disk. Provide this when creating the disk. For example: projects/project /zones/zone/diskTypes/pd-ssd . See Persistent disk types.
       "userLicenses": [ # A list of publicly visible user-licenses. Unlike regular licenses, user provided licenses can be modified after the disk is created. This includes a list of URLs to the license resource. For example, to provide a debian license: https://www.googleapis.com/compute/v1/projects/debian-cloud/global/licenses/debian-9-stretch
         "A String",
       ],
@@ -1558,7 +1560,7 @@
   "name": "A String", # Name of the resource. Provided by the client when the resource is created. The name must be 1-63 characters long, and comply with RFC1035. Specifically, the name must be 1-63 characters long and match the regular expression `[a-z]([-a-z0-9]*[a-z0-9])?` which means the first character must be a lowercase letter, and all following characters must be a dash, lowercase letter, or digit, except the last character, which cannot be a dash.
   "options": "A String", # Internal use only.
   "physicalBlockSizeBytes": "A String", # Physical block size of the persistent disk, in bytes. If not present in a request, a default value is used. The currently supported size is 4096, other sizes may be added in the future. If an unsupported value is requested, the error message will list the supported values for the caller's project.
-  "provisionedIops": "A String", # Indicates how many IOPS must be provisioned for the disk.
+  "provisionedIops": "A String", # Indicates how many IOPS to provision for the disk. This sets the number of I/O operations per second that the disk can handle. Values must be between 10,000 and 120,000. For more details, see the Extreme persistent disk documentation.
   "region": "A String", # [Output Only] URL of the region where the disk resides. Only applicable for regional resources. You must specify this field as part of the HTTP request URL. It is not settable as a field in the request body.
   "replicaZones": [ # URLs of the zones where the disk should be replicated to. Only applicable for regional resources.
     "A String",
@@ -1597,7 +1599,7 @@
   "sourceStorageObject": "A String", # The full Google Cloud Storage URI where the disk image is stored. This file must be a gzip-compressed tarball whose name ends in .tar.gz or virtual machine disk whose name ends in vmdk. Valid URIs may start with gs:// or https://storage.googleapis.com/. This flag is not optimized for creating multiple disks from a source storage object. To create many disks from a source storage object, use gcloud compute images import instead.
   "status": "A String", # [Output Only] The status of disk creation. - CREATING: Disk is provisioning. - RESTORING: Source data is being copied into the disk. - FAILED: Disk creation failed. - READY: Disk is ready for use. - DELETING: Disk is deleting.
   "storageType": "A String", # [Deprecated] Storage type of the persistent disk.
-  "type": "A String", # URL of the disk type resource describing which disk type to use to create the disk. Provide this when creating the disk. For example: projects/project /zones/zone/diskTypes/pd-standard or pd-ssd
+  "type": "A String", # URL of the disk type resource describing which disk type to use to create the disk. Provide this when creating the disk. For example: projects/project /zones/zone/diskTypes/pd-ssd . See Persistent disk types.
   "userLicenses": [ # A list of publicly visible user-licenses. Unlike regular licenses, user provided licenses can be modified after the disk is created. This includes a list of URLs to the license resource. For example, to provide a debian license: https://www.googleapis.com/compute/v1/projects/debian-cloud/global/licenses/debian-9-stretch
     "A String",
   ],