chore: Update discovery artifacts (#1493)

## Deleted keys were detected in the following stable discovery artifacts:
documentai v1 https://github.com/googleapis/google-api-python-client/commit/3d6892c775b31d0ed6caead07666e423dccdba62
iam v1 https://github.com/googleapis/google-api-python-client/commit/98682633e8d244ca7bbf5b3726ed305e338a1cdd
osconfig v1 https://github.com/googleapis/google-api-python-client/commit/588812ffa314a68be1be61e229a187aecbe587e4

## Deleted keys were detected in the following pre-stable discovery artifacts:
compute alpha https://github.com/googleapis/google-api-python-client/commit/3740a88b497c25e6a5aee22f873c33117034f8fa
compute beta https://github.com/googleapis/google-api-python-client/commit/3740a88b497c25e6a5aee22f873c33117034f8fa
documentai v1beta3 https://github.com/googleapis/google-api-python-client/commit/3d6892c775b31d0ed6caead07666e423dccdba62
ideahub v1alpha https://github.com/googleapis/google-api-python-client/commit/942102dcc79691866f8febbb732e477d0e5227b4

## Discovery Artifact Change Summary:
feat(analyticsadmin): update the api https://github.com/googleapis/google-api-python-client/commit/8e0c67f316381ec1ad358a079207215293093603
feat(apigee): update the api https://github.com/googleapis/google-api-python-client/commit/9fd19ee8a70661be02219133dda1b80d71ac4f4b
feat(appengine): update the api https://github.com/googleapis/google-api-python-client/commit/9727d32278b91dfa30d4c8c597755323741f8cd4
feat(bigquerydatatransfer): update the api https://github.com/googleapis/google-api-python-client/commit/0b36baa0400731507365bf477cc223729d5a109d
feat(cloudfunctions): update the api https://github.com/googleapis/google-api-python-client/commit/c138aff559b32709a8a81c271ab5c0c48ea3acbe
feat(compute): update the api https://github.com/googleapis/google-api-python-client/commit/3740a88b497c25e6a5aee22f873c33117034f8fa
feat(container): update the api https://github.com/googleapis/google-api-python-client/commit/90b095a5de68d5aebcfbea16078b4727774366f4
feat(containeranalysis): update the api https://github.com/googleapis/google-api-python-client/commit/07d2f4383aef325a7351831909e6cfc4b4b9f889
feat(documentai): update the api https://github.com/googleapis/google-api-python-client/commit/3d6892c775b31d0ed6caead07666e423dccdba62
feat(gkehub): update the api https://github.com/googleapis/google-api-python-client/commit/1676d9f17b499d3bb13f80ad9c4fbd0621961a41
feat(iam): update the api https://github.com/googleapis/google-api-python-client/commit/98682633e8d244ca7bbf5b3726ed305e338a1cdd
feat(ideahub): update the api https://github.com/googleapis/google-api-python-client/commit/942102dcc79691866f8febbb732e477d0e5227b4
feat(ondemandscanning): update the api https://github.com/googleapis/google-api-python-client/commit/97169382a9d0c80bf56af157a16c5b96cb95e6dd
feat(osconfig): update the api https://github.com/googleapis/google-api-python-client/commit/588812ffa314a68be1be61e229a187aecbe587e4
feat(people): update the api https://github.com/googleapis/google-api-python-client/commit/213598c2a41d6724368e1089bc3cbcaa0b2932c5
feat(securitycenter): update the api https://github.com/googleapis/google-api-python-client/commit/74bee354cf1dbaf388de26e756e9aeebe0baa311
feat(slides): update the api https://github.com/googleapis/google-api-python-client/commit/623c740d1333cfea2b5946cc22ebcc2c44a2197d
feat(tagmanager): update the api https://github.com/googleapis/google-api-python-client/commit/98664145c692ed1ca947bdb081a7463897655d28
diff --git a/docs/dyn/compute_alpha.vpnGateways.html b/docs/dyn/compute_alpha.vpnGateways.html
index 409ad83..ad3b144 100644
--- a/docs/dyn/compute_alpha.vpnGateways.html
+++ b/docs/dyn/compute_alpha.vpnGateways.html
@@ -146,6 +146,7 @@
           "network": "A String", # URL of the network to which this VPN gateway is attached. Provided by the client when the VPN gateway is created.
           "region": "A String", # [Output Only] URL of the region where the VPN gateway resides.
           "selfLink": "A String", # [Output Only] Server-defined URL for the resource.
+          "stackType": "A String", # The stack type for this VPN gateway to identify the IP protocols that are enabled. If not specified, IPV4_ONLY will be used.
           "vpnInterfaces": [ # The list of VPN interfaces associated with this VPN gateway.
             { # A VPN gateway interface.
               "id": 42, # [Output Only] Numeric identifier for this VPN interface associated with the VPN gateway.
@@ -299,6 +300,7 @@
   "network": "A String", # URL of the network to which this VPN gateway is attached. Provided by the client when the VPN gateway is created.
   "region": "A String", # [Output Only] URL of the region where the VPN gateway resides.
   "selfLink": "A String", # [Output Only] Server-defined URL for the resource.
+  "stackType": "A String", # The stack type for this VPN gateway to identify the IP protocols that are enabled. If not specified, IPV4_ONLY will be used.
   "vpnInterfaces": [ # The list of VPN interfaces associated with this VPN gateway.
     { # A VPN gateway interface.
       "id": 42, # [Output Only] Numeric identifier for this VPN interface associated with the VPN gateway.
@@ -371,6 +373,7 @@
   "network": "A String", # URL of the network to which this VPN gateway is attached. Provided by the client when the VPN gateway is created.
   "region": "A String", # [Output Only] URL of the region where the VPN gateway resides.
   "selfLink": "A String", # [Output Only] Server-defined URL for the resource.
+  "stackType": "A String", # The stack type for this VPN gateway to identify the IP protocols that are enabled. If not specified, IPV4_ONLY will be used.
   "vpnInterfaces": [ # The list of VPN interfaces associated with this VPN gateway.
     { # A VPN gateway interface.
       "id": 42, # [Output Only] Numeric identifier for this VPN interface associated with the VPN gateway.
@@ -473,6 +476,7 @@
       "network": "A String", # URL of the network to which this VPN gateway is attached. Provided by the client when the VPN gateway is created.
       "region": "A String", # [Output Only] URL of the region where the VPN gateway resides.
       "selfLink": "A String", # [Output Only] Server-defined URL for the resource.
+      "stackType": "A String", # The stack type for this VPN gateway to identify the IP protocols that are enabled. If not specified, IPV4_ONLY will be used.
       "vpnInterfaces": [ # The list of VPN interfaces associated with this VPN gateway.
         { # A VPN gateway interface.
           "id": 42, # [Output Only] Numeric identifier for this VPN interface associated with the VPN gateway.