build: run docs regen in synth.py (#1059)

diff --git a/docs/dyn/compute_alpha.interconnectAttachments.html b/docs/dyn/compute_alpha.interconnectAttachments.html
index 5b709b2..d2b5035 100644
--- a/docs/dyn/compute_alpha.interconnectAttachments.html
+++ b/docs/dyn/compute_alpha.interconnectAttachments.html
@@ -168,12 +168,15 @@
             "cloudRouterIpAddress": "A String", # [Output Only] IPv4 address + prefix length to be configured on Cloud Router Interface for this interconnect attachment.
             "creationTimestamp": "A String", # [Output Only] Creation timestamp in RFC3339 text format.
             "customerRouterIpAddress": "A String", # [Output Only] IPv4 address + prefix length to be configured on the customer router subinterface for this interconnect attachment.
+            "dataplaneVersion": 42, # [Output Only] Dataplane version for this InterconnectAttachment.
             "description": "A String", # An optional description of this resource.
             "edgeAvailabilityDomain": "A String", # Desired availability domain for the attachment. Only available for type PARTNER, at creation time, and can take one of the following values:
                 # - AVAILABILITY_DOMAIN_ANY
                 # - AVAILABILITY_DOMAIN_1
                 # - AVAILABILITY_DOMAIN_2 For improved reliability, customers should configure a pair of attachments, one per availability domain. The selected availability domain will be provided to the Partner via the pairing key, so that the provisioned circuit will lie in the specified domain. If not specified, the value will default to AVAILABILITY_DOMAIN_ANY.
-            "encryption": "A String", # Indicates the user-supplied encryption option of this interconnect attachment.
+            "encryption": "A String", # Indicates the user-supplied encryption option of this interconnect attachment:
+                # - NONE is the default value, which means that the attachment carries unencrypted traffic. VMs can send traffic to, or receive traffic from, this type of attachment.
+                # - IPSEC indicates that the attachment carries only traffic encrypted by an IPsec device such as an HA VPN gateway. VMs cannot directly send traffic to, or receive traffic from, such an attachment. To use IPsec over Interconnect, create the attachment using this option.
             "googleReferenceId": "A String", # [Output Only] Google reference ID, to be used when raising support tickets with Google or otherwise to debug backend connectivity issues. [Deprecated] This field is not used.
             "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
             "interconnect": "A String", # URL of the underlying Interconnect object that this attachment's traffic will traverse through.
@@ -385,12 +388,15 @@
     "cloudRouterIpAddress": "A String", # [Output Only] IPv4 address + prefix length to be configured on Cloud Router Interface for this interconnect attachment.
     "creationTimestamp": "A String", # [Output Only] Creation timestamp in RFC3339 text format.
     "customerRouterIpAddress": "A String", # [Output Only] IPv4 address + prefix length to be configured on the customer router subinterface for this interconnect attachment.
+    "dataplaneVersion": 42, # [Output Only] Dataplane version for this InterconnectAttachment.
     "description": "A String", # An optional description of this resource.
     "edgeAvailabilityDomain": "A String", # Desired availability domain for the attachment. Only available for type PARTNER, at creation time, and can take one of the following values:
         # - AVAILABILITY_DOMAIN_ANY
         # - AVAILABILITY_DOMAIN_1
         # - AVAILABILITY_DOMAIN_2 For improved reliability, customers should configure a pair of attachments, one per availability domain. The selected availability domain will be provided to the Partner via the pairing key, so that the provisioned circuit will lie in the specified domain. If not specified, the value will default to AVAILABILITY_DOMAIN_ANY.
-    "encryption": "A String", # Indicates the user-supplied encryption option of this interconnect attachment.
+    "encryption": "A String", # Indicates the user-supplied encryption option of this interconnect attachment:
+        # - NONE is the default value, which means that the attachment carries unencrypted traffic. VMs can send traffic to, or receive traffic from, this type of attachment.
+        # - IPSEC indicates that the attachment carries only traffic encrypted by an IPsec device such as an HA VPN gateway. VMs cannot directly send traffic to, or receive traffic from, such an attachment. To use IPsec over Interconnect, create the attachment using this option.
     "googleReferenceId": "A String", # [Output Only] Google reference ID, to be used when raising support tickets with Google or otherwise to debug backend connectivity issues. [Deprecated] This field is not used.
     "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
     "interconnect": "A String", # URL of the underlying Interconnect object that this attachment's traffic will traverse through.
@@ -668,12 +674,15 @@
   "cloudRouterIpAddress": "A String", # [Output Only] IPv4 address + prefix length to be configured on Cloud Router Interface for this interconnect attachment.
   "creationTimestamp": "A String", # [Output Only] Creation timestamp in RFC3339 text format.
   "customerRouterIpAddress": "A String", # [Output Only] IPv4 address + prefix length to be configured on the customer router subinterface for this interconnect attachment.
+  "dataplaneVersion": 42, # [Output Only] Dataplane version for this InterconnectAttachment.
   "description": "A String", # An optional description of this resource.
   "edgeAvailabilityDomain": "A String", # Desired availability domain for the attachment. Only available for type PARTNER, at creation time, and can take one of the following values:
       # - AVAILABILITY_DOMAIN_ANY
       # - AVAILABILITY_DOMAIN_1
       # - AVAILABILITY_DOMAIN_2 For improved reliability, customers should configure a pair of attachments, one per availability domain. The selected availability domain will be provided to the Partner via the pairing key, so that the provisioned circuit will lie in the specified domain. If not specified, the value will default to AVAILABILITY_DOMAIN_ANY.
-  "encryption": "A String", # Indicates the user-supplied encryption option of this interconnect attachment.
+  "encryption": "A String", # Indicates the user-supplied encryption option of this interconnect attachment:
+      # - NONE is the default value, which means that the attachment carries unencrypted traffic. VMs can send traffic to, or receive traffic from, this type of attachment.
+      # - IPSEC indicates that the attachment carries only traffic encrypted by an IPsec device such as an HA VPN gateway. VMs cannot directly send traffic to, or receive traffic from, such an attachment. To use IPsec over Interconnect, create the attachment using this option.
   "googleReferenceId": "A String", # [Output Only] Google reference ID, to be used when raising support tickets with Google or otherwise to debug backend connectivity issues. [Deprecated] This field is not used.
   "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
   "interconnect": "A String", # URL of the underlying Interconnect object that this attachment's traffic will traverse through.
@@ -843,12 +852,15 @@
         "cloudRouterIpAddress": "A String", # [Output Only] IPv4 address + prefix length to be configured on Cloud Router Interface for this interconnect attachment.
         "creationTimestamp": "A String", # [Output Only] Creation timestamp in RFC3339 text format.
         "customerRouterIpAddress": "A String", # [Output Only] IPv4 address + prefix length to be configured on the customer router subinterface for this interconnect attachment.
+        "dataplaneVersion": 42, # [Output Only] Dataplane version for this InterconnectAttachment.
         "description": "A String", # An optional description of this resource.
         "edgeAvailabilityDomain": "A String", # Desired availability domain for the attachment. Only available for type PARTNER, at creation time, and can take one of the following values:
             # - AVAILABILITY_DOMAIN_ANY
             # - AVAILABILITY_DOMAIN_1
             # - AVAILABILITY_DOMAIN_2 For improved reliability, customers should configure a pair of attachments, one per availability domain. The selected availability domain will be provided to the Partner via the pairing key, so that the provisioned circuit will lie in the specified domain. If not specified, the value will default to AVAILABILITY_DOMAIN_ANY.
-        "encryption": "A String", # Indicates the user-supplied encryption option of this interconnect attachment.
+        "encryption": "A String", # Indicates the user-supplied encryption option of this interconnect attachment:
+            # - NONE is the default value, which means that the attachment carries unencrypted traffic. VMs can send traffic to, or receive traffic from, this type of attachment.
+            # - IPSEC indicates that the attachment carries only traffic encrypted by an IPsec device such as an HA VPN gateway. VMs cannot directly send traffic to, or receive traffic from, such an attachment. To use IPsec over Interconnect, create the attachment using this option.
         "googleReferenceId": "A String", # [Output Only] Google reference ID, to be used when raising support tickets with Google or otherwise to debug backend connectivity issues. [Deprecated] This field is not used.
         "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
         "interconnect": "A String", # URL of the underlying Interconnect object that this attachment's traffic will traverse through.
@@ -960,12 +972,15 @@
   "cloudRouterIpAddress": "A String", # [Output Only] IPv4 address + prefix length to be configured on Cloud Router Interface for this interconnect attachment.
   "creationTimestamp": "A String", # [Output Only] Creation timestamp in RFC3339 text format.
   "customerRouterIpAddress": "A String", # [Output Only] IPv4 address + prefix length to be configured on the customer router subinterface for this interconnect attachment.
+  "dataplaneVersion": 42, # [Output Only] Dataplane version for this InterconnectAttachment.
   "description": "A String", # An optional description of this resource.
   "edgeAvailabilityDomain": "A String", # Desired availability domain for the attachment. Only available for type PARTNER, at creation time, and can take one of the following values:
       # - AVAILABILITY_DOMAIN_ANY
       # - AVAILABILITY_DOMAIN_1
       # - AVAILABILITY_DOMAIN_2 For improved reliability, customers should configure a pair of attachments, one per availability domain. The selected availability domain will be provided to the Partner via the pairing key, so that the provisioned circuit will lie in the specified domain. If not specified, the value will default to AVAILABILITY_DOMAIN_ANY.
-  "encryption": "A String", # Indicates the user-supplied encryption option of this interconnect attachment.
+  "encryption": "A String", # Indicates the user-supplied encryption option of this interconnect attachment:
+      # - NONE is the default value, which means that the attachment carries unencrypted traffic. VMs can send traffic to, or receive traffic from, this type of attachment.
+      # - IPSEC indicates that the attachment carries only traffic encrypted by an IPsec device such as an HA VPN gateway. VMs cannot directly send traffic to, or receive traffic from, such an attachment. To use IPsec over Interconnect, create the attachment using this option.
   "googleReferenceId": "A String", # [Output Only] Google reference ID, to be used when raising support tickets with Google or otherwise to debug backend connectivity issues. [Deprecated] This field is not used.
   "id": "A String", # [Output Only] The unique identifier for the resource. This identifier is defined by the server.
   "interconnect": "A String", # URL of the underlying Interconnect object that this attachment's traffic will traverse through.