docs: update generated docs (#981)

diff --git a/docs/dyn/compute_alpha.images.html b/docs/dyn/compute_alpha.images.html
index c94c9bc..f56da3a 100644
--- a/docs/dyn/compute_alpha.images.html
+++ b/docs/dyn/compute_alpha.images.html
@@ -390,10 +390,13 @@
       "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 image. This value may be used to determine whether the image was taken from the current or a previous instance of a given disk name.
-    "sourceImage": "A String", # URL of the source image used to create this image. This can be a full or valid partial URL. You must provide exactly one of:
-        # - this property, or
-        # - the rawDisk.source property, or
-        # - the sourceDisk property   in order to create an image.
+    "sourceImage": "A String", # URL of the source image used to create this image.
+        #
+        # In order to create an image, you must provide the full or partial URL of one of the following:
+        # - The selfLink URL
+        # - This property
+        # - The rawDisk.source URL
+        # - The sourceDisk URL
     "sourceImageEncryptionKey": { # Represents a customer-supplied encryption key # The customer-supplied encryption key of the source image. Required if the source image is protected by a customer-supplied encryption key.
       "kmsKeyName": "A String", # The name of the encryption key that is stored in Google Cloud KMS.
       "kmsKeyServiceAccount": "A String", # The service account being used for the encryption request for the given KMS key. If absent, the Compute Engine default service account is used.
@@ -407,11 +410,14 @@
       "sha256": "A String", # [Output only] The RFC 4648 base64 encoded SHA-256 hash of the customer-supplied encryption key that protects this resource.
     },
     "sourceImageId": "A String", # [Output Only] The ID value of the image used to create this image. This value may be used to determine whether the image was taken from the current or a previous instance of a given image name.
-    "sourceSnapshot": "A String", # URL of the source snapshot used to create this image. This can be a full or valid partial URL. You must provide exactly one of:
-        # - this property, or
-        # - the sourceImage property, or
-        # - the rawDisk.source property, or
-        # - the sourceDisk property   in order to create an image.
+    "sourceSnapshot": "A String", # URL of the source snapshot used to create this image.
+        #
+        # In order to create an image, you must provide the full or partial URL of one of the following:
+        # - The selfLink URL
+        # - This property
+        # - The sourceImage URL
+        # - The rawDisk.source URL
+        # - The sourceDisk URL
     "sourceSnapshotEncryptionKey": { # Represents a customer-supplied encryption key # The customer-supplied encryption key of the source snapshot. Required if the source snapshot is protected by a customer-supplied encryption key.
       "kmsKeyName": "A String", # The name of the encryption key that is stored in Google Cloud KMS.
       "kmsKeyServiceAccount": "A String", # The service account being used for the encryption request for the given KMS key. If absent, the Compute Engine default service account is used.
@@ -545,10 +551,13 @@
       "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 image. This value may be used to determine whether the image was taken from the current or a previous instance of a given disk name.
-    "sourceImage": "A String", # URL of the source image used to create this image. This can be a full or valid partial URL. You must provide exactly one of:
-        # - this property, or
-        # - the rawDisk.source property, or
-        # - the sourceDisk property   in order to create an image.
+    "sourceImage": "A String", # URL of the source image used to create this image.
+        #
+        # In order to create an image, you must provide the full or partial URL of one of the following:
+        # - The selfLink URL
+        # - This property
+        # - The rawDisk.source URL
+        # - The sourceDisk URL
     "sourceImageEncryptionKey": { # Represents a customer-supplied encryption key # The customer-supplied encryption key of the source image. Required if the source image is protected by a customer-supplied encryption key.
       "kmsKeyName": "A String", # The name of the encryption key that is stored in Google Cloud KMS.
       "kmsKeyServiceAccount": "A String", # The service account being used for the encryption request for the given KMS key. If absent, the Compute Engine default service account is used.
@@ -562,11 +571,14 @@
       "sha256": "A String", # [Output only] The RFC 4648 base64 encoded SHA-256 hash of the customer-supplied encryption key that protects this resource.
     },
     "sourceImageId": "A String", # [Output Only] The ID value of the image used to create this image. This value may be used to determine whether the image was taken from the current or a previous instance of a given image name.
-    "sourceSnapshot": "A String", # URL of the source snapshot used to create this image. This can be a full or valid partial URL. You must provide exactly one of:
-        # - this property, or
-        # - the sourceImage property, or
-        # - the rawDisk.source property, or
-        # - the sourceDisk property   in order to create an image.
+    "sourceSnapshot": "A String", # URL of the source snapshot used to create this image.
+        #
+        # In order to create an image, you must provide the full or partial URL of one of the following:
+        # - The selfLink URL
+        # - This property
+        # - The sourceImage URL
+        # - The rawDisk.source URL
+        # - The sourceDisk URL
     "sourceSnapshotEncryptionKey": { # Represents a customer-supplied encryption key # The customer-supplied encryption key of the source snapshot. Required if the source snapshot is protected by a customer-supplied encryption key.
       "kmsKeyName": "A String", # The name of the encryption key that is stored in Google Cloud KMS.
       "kmsKeyServiceAccount": "A String", # The service account being used for the encryption request for the given KMS key. If absent, the Compute Engine default service account is used.
@@ -624,13 +636,13 @@
           #
           # Example Policy with multiple AuditConfigs:
           #
-          # { "audit_configs": [ { "service": "allServices" "audit_log_configs": [ { "log_type": "DATA_READ", "exempted_members": [ "user:jose@example.com" ] }, { "log_type": "DATA_WRITE", }, { "log_type": "ADMIN_READ", } ] }, { "service": "sampleservice.googleapis.com" "audit_log_configs": [ { "log_type": "DATA_READ", }, { "log_type": "DATA_WRITE", "exempted_members": [ "user:aliya@example.com" ] } ] } ] }
+          # { "audit_configs": [ { "service": "allServices", "audit_log_configs": [ { "log_type": "DATA_READ", "exempted_members": [ "user:jose@example.com" ] }, { "log_type": "DATA_WRITE" }, { "log_type": "ADMIN_READ" } ] }, { "service": "sampleservice.googleapis.com", "audit_log_configs": [ { "log_type": "DATA_READ" }, { "log_type": "DATA_WRITE", "exempted_members": [ "user:aliya@example.com" ] } ] } ] }
           #
           # For sampleservice, this policy enables DATA_READ, DATA_WRITE and ADMIN_READ logging. It also exempts jose@example.com from DATA_READ logging, and aliya@example.com from DATA_WRITE logging.
         "auditLogConfigs": [ # The configuration for logging of each type of permission.
           { # Provides the configuration for logging a type of permissions. Example:
               #
-              # { "audit_log_configs": [ { "log_type": "DATA_READ", "exempted_members": [ "user:jose@example.com" ] }, { "log_type": "DATA_WRITE", } ] }
+              # { "audit_log_configs": [ { "log_type": "DATA_READ", "exempted_members": [ "user:jose@example.com" ] }, { "log_type": "DATA_WRITE" } ] }
               #
               # This enables 'DATA_READ' and 'DATA_WRITE' logging, while exempting jose@example.com from DATA_READ logging.
             "exemptedMembers": [ # Specifies the identities that do not cause logging for this type of permission. Follows the same format of [Binding.members][].
@@ -893,10 +905,13 @@
     "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 image. This value may be used to determine whether the image was taken from the current or a previous instance of a given disk name.
-  "sourceImage": "A String", # URL of the source image used to create this image. This can be a full or valid partial URL. You must provide exactly one of:
-      # - this property, or
-      # - the rawDisk.source property, or
-      # - the sourceDisk property   in order to create an image.
+  "sourceImage": "A String", # URL of the source image used to create this image.
+      # 
+      # In order to create an image, you must provide the full or partial URL of one of the following:
+      # - The selfLink URL
+      # - This property
+      # - The rawDisk.source URL
+      # - The sourceDisk URL
   "sourceImageEncryptionKey": { # Represents a customer-supplied encryption key # The customer-supplied encryption key of the source image. Required if the source image is protected by a customer-supplied encryption key.
     "kmsKeyName": "A String", # The name of the encryption key that is stored in Google Cloud KMS.
     "kmsKeyServiceAccount": "A String", # The service account being used for the encryption request for the given KMS key. If absent, the Compute Engine default service account is used.
@@ -910,11 +925,14 @@
     "sha256": "A String", # [Output only] The RFC 4648 base64 encoded SHA-256 hash of the customer-supplied encryption key that protects this resource.
   },
   "sourceImageId": "A String", # [Output Only] The ID value of the image used to create this image. This value may be used to determine whether the image was taken from the current or a previous instance of a given image name.
-  "sourceSnapshot": "A String", # URL of the source snapshot used to create this image. This can be a full or valid partial URL. You must provide exactly one of:
-      # - this property, or
-      # - the sourceImage property, or
-      # - the rawDisk.source property, or
-      # - the sourceDisk property   in order to create an image.
+  "sourceSnapshot": "A String", # URL of the source snapshot used to create this image.
+      # 
+      # In order to create an image, you must provide the full or partial URL of one of the following:
+      # - The selfLink URL
+      # - This property
+      # - The sourceImage URL
+      # - The rawDisk.source URL
+      # - The sourceDisk URL
   "sourceSnapshotEncryptionKey": { # Represents a customer-supplied encryption key # The customer-supplied encryption key of the source snapshot. Required if the source snapshot is protected by a customer-supplied encryption key.
     "kmsKeyName": "A String", # The name of the encryption key that is stored in Google Cloud KMS.
     "kmsKeyServiceAccount": "A String", # The service account being used for the encryption request for the given KMS key. If absent, the Compute Engine default service account is used.
@@ -1135,10 +1153,13 @@
           "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 image. This value may be used to determine whether the image was taken from the current or a previous instance of a given disk name.
-        "sourceImage": "A String", # URL of the source image used to create this image. This can be a full or valid partial URL. You must provide exactly one of:
-            # - this property, or
-            # - the rawDisk.source property, or
-            # - the sourceDisk property   in order to create an image.
+        "sourceImage": "A String", # URL of the source image used to create this image.
+            #
+            # In order to create an image, you must provide the full or partial URL of one of the following:
+            # - The selfLink URL
+            # - This property
+            # - The rawDisk.source URL
+            # - The sourceDisk URL
         "sourceImageEncryptionKey": { # Represents a customer-supplied encryption key # The customer-supplied encryption key of the source image. Required if the source image is protected by a customer-supplied encryption key.
           "kmsKeyName": "A String", # The name of the encryption key that is stored in Google Cloud KMS.
           "kmsKeyServiceAccount": "A String", # The service account being used for the encryption request for the given KMS key. If absent, the Compute Engine default service account is used.
@@ -1152,11 +1173,14 @@
           "sha256": "A String", # [Output only] The RFC 4648 base64 encoded SHA-256 hash of the customer-supplied encryption key that protects this resource.
         },
         "sourceImageId": "A String", # [Output Only] The ID value of the image used to create this image. This value may be used to determine whether the image was taken from the current or a previous instance of a given image name.
-        "sourceSnapshot": "A String", # URL of the source snapshot used to create this image. This can be a full or valid partial URL. You must provide exactly one of:
-            # - this property, or
-            # - the sourceImage property, or
-            # - the rawDisk.source property, or
-            # - the sourceDisk property   in order to create an image.
+        "sourceSnapshot": "A String", # URL of the source snapshot used to create this image.
+            #
+            # In order to create an image, you must provide the full or partial URL of one of the following:
+            # - The selfLink URL
+            # - This property
+            # - The sourceImage URL
+            # - The rawDisk.source URL
+            # - The sourceDisk URL
         "sourceSnapshotEncryptionKey": { # Represents a customer-supplied encryption key # The customer-supplied encryption key of the source snapshot. Required if the source snapshot is protected by a customer-supplied encryption key.
           "kmsKeyName": "A String", # The name of the encryption key that is stored in Google Cloud KMS.
           "kmsKeyServiceAccount": "A String", # The service account being used for the encryption request for the given KMS key. If absent, the Compute Engine default service account is used.
@@ -1319,10 +1343,13 @@
     "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 image. This value may be used to determine whether the image was taken from the current or a previous instance of a given disk name.
-  "sourceImage": "A String", # URL of the source image used to create this image. This can be a full or valid partial URL. You must provide exactly one of:
-      # - this property, or
-      # - the rawDisk.source property, or
-      # - the sourceDisk property   in order to create an image.
+  "sourceImage": "A String", # URL of the source image used to create this image.
+      # 
+      # In order to create an image, you must provide the full or partial URL of one of the following:
+      # - The selfLink URL
+      # - This property
+      # - The rawDisk.source URL
+      # - The sourceDisk URL
   "sourceImageEncryptionKey": { # Represents a customer-supplied encryption key # The customer-supplied encryption key of the source image. Required if the source image is protected by a customer-supplied encryption key.
     "kmsKeyName": "A String", # The name of the encryption key that is stored in Google Cloud KMS.
     "kmsKeyServiceAccount": "A String", # The service account being used for the encryption request for the given KMS key. If absent, the Compute Engine default service account is used.
@@ -1336,11 +1363,14 @@
     "sha256": "A String", # [Output only] The RFC 4648 base64 encoded SHA-256 hash of the customer-supplied encryption key that protects this resource.
   },
   "sourceImageId": "A String", # [Output Only] The ID value of the image used to create this image. This value may be used to determine whether the image was taken from the current or a previous instance of a given image name.
-  "sourceSnapshot": "A String", # URL of the source snapshot used to create this image. This can be a full or valid partial URL. You must provide exactly one of:
-      # - this property, or
-      # - the sourceImage property, or
-      # - the rawDisk.source property, or
-      # - the sourceDisk property   in order to create an image.
+  "sourceSnapshot": "A String", # URL of the source snapshot used to create this image.
+      # 
+      # In order to create an image, you must provide the full or partial URL of one of the following:
+      # - The selfLink URL
+      # - This property
+      # - The sourceImage URL
+      # - The rawDisk.source URL
+      # - The sourceDisk URL
   "sourceSnapshotEncryptionKey": { # Represents a customer-supplied encryption key # The customer-supplied encryption key of the source snapshot. Required if the source snapshot is protected by a customer-supplied encryption key.
     "kmsKeyName": "A String", # The name of the encryption key that is stored in Google Cloud KMS.
     "kmsKeyServiceAccount": "A String", # The service account being used for the encryption request for the given KMS key. If absent, the Compute Engine default service account is used.
@@ -1527,13 +1557,13 @@
             #
             # Example Policy with multiple AuditConfigs:
             #
-            # { "audit_configs": [ { "service": "allServices" "audit_log_configs": [ { "log_type": "DATA_READ", "exempted_members": [ "user:jose@example.com" ] }, { "log_type": "DATA_WRITE", }, { "log_type": "ADMIN_READ", } ] }, { "service": "sampleservice.googleapis.com" "audit_log_configs": [ { "log_type": "DATA_READ", }, { "log_type": "DATA_WRITE", "exempted_members": [ "user:aliya@example.com" ] } ] } ] }
+            # { "audit_configs": [ { "service": "allServices", "audit_log_configs": [ { "log_type": "DATA_READ", "exempted_members": [ "user:jose@example.com" ] }, { "log_type": "DATA_WRITE" }, { "log_type": "ADMIN_READ" } ] }, { "service": "sampleservice.googleapis.com", "audit_log_configs": [ { "log_type": "DATA_READ" }, { "log_type": "DATA_WRITE", "exempted_members": [ "user:aliya@example.com" ] } ] } ] }
             #
             # For sampleservice, this policy enables DATA_READ, DATA_WRITE and ADMIN_READ logging. It also exempts jose@example.com from DATA_READ logging, and aliya@example.com from DATA_WRITE logging.
           "auditLogConfigs": [ # The configuration for logging of each type of permission.
             { # Provides the configuration for logging a type of permissions. Example:
                 #
-                # { "audit_log_configs": [ { "log_type": "DATA_READ", "exempted_members": [ "user:jose@example.com" ] }, { "log_type": "DATA_WRITE", } ] }
+                # { "audit_log_configs": [ { "log_type": "DATA_READ", "exempted_members": [ "user:jose@example.com" ] }, { "log_type": "DATA_WRITE" } ] }
                 #
                 # This enables 'DATA_READ' and 'DATA_WRITE' logging, while exempting jose@example.com from DATA_READ logging.
               "exemptedMembers": [ # Specifies the identities that do not cause logging for this type of permission. Follows the same format of [Binding.members][].
@@ -1714,13 +1744,13 @@
           #
           # Example Policy with multiple AuditConfigs:
           #
-          # { "audit_configs": [ { "service": "allServices" "audit_log_configs": [ { "log_type": "DATA_READ", "exempted_members": [ "user:jose@example.com" ] }, { "log_type": "DATA_WRITE", }, { "log_type": "ADMIN_READ", } ] }, { "service": "sampleservice.googleapis.com" "audit_log_configs": [ { "log_type": "DATA_READ", }, { "log_type": "DATA_WRITE", "exempted_members": [ "user:aliya@example.com" ] } ] } ] }
+          # { "audit_configs": [ { "service": "allServices", "audit_log_configs": [ { "log_type": "DATA_READ", "exempted_members": [ "user:jose@example.com" ] }, { "log_type": "DATA_WRITE" }, { "log_type": "ADMIN_READ" } ] }, { "service": "sampleservice.googleapis.com", "audit_log_configs": [ { "log_type": "DATA_READ" }, { "log_type": "DATA_WRITE", "exempted_members": [ "user:aliya@example.com" ] } ] } ] }
           #
           # For sampleservice, this policy enables DATA_READ, DATA_WRITE and ADMIN_READ logging. It also exempts jose@example.com from DATA_READ logging, and aliya@example.com from DATA_WRITE logging.
         "auditLogConfigs": [ # The configuration for logging of each type of permission.
           { # Provides the configuration for logging a type of permissions. Example:
               #
-              # { "audit_log_configs": [ { "log_type": "DATA_READ", "exempted_members": [ "user:jose@example.com" ] }, { "log_type": "DATA_WRITE", } ] }
+              # { "audit_log_configs": [ { "log_type": "DATA_READ", "exempted_members": [ "user:jose@example.com" ] }, { "log_type": "DATA_WRITE" } ] }
               #
               # This enables 'DATA_READ' and 'DATA_WRITE' logging, while exempting jose@example.com from DATA_READ logging.
             "exemptedMembers": [ # Specifies the identities that do not cause logging for this type of permission. Follows the same format of [Binding.members][].