chore: Update discovery artifacts (#1325)

## Deleted keys were detected in the following stable discovery artifacts:
apigeev1[ [More details]](https://github.com/googleapis/google-api-python-client/commit/9106808da3e03faa4c27913358e0c07edd82ff5a)

## Discovery Artifact Change Summary:
apigeev1[ [More details]](https://github.com/googleapis/google-api-python-client/commit/9106808da3e03faa4c27913358e0c07edd82ff5a)
dataflowv1b3[ [More details]](https://github.com/googleapis/google-api-python-client/commit/9dd646184e70a83831f3347fc01a3eb0090ca0e8)
dialogflowv2[ [More details]](https://github.com/googleapis/google-api-python-client/commit/a7f2e96e6b283771e986d9ec7f1f057ff67e2a29)
dialogflowv2beta1[ [More details]](https://github.com/googleapis/google-api-python-client/commit/a7f2e96e6b283771e986d9ec7f1f057ff67e2a29)
dialogflowv3[ [More details]](https://github.com/googleapis/google-api-python-client/commit/a7f2e96e6b283771e986d9ec7f1f057ff67e2a29)
documentaiv1beta3[ [More details]](https://github.com/googleapis/google-api-python-client/commit/ee1318d36230ff4b7393ce1f15d6a9ee71d23cea)
healthcarev1[ [More details]](https://github.com/googleapis/google-api-python-client/commit/1204c1d486e08630773812ff1cc35843d98eb1d8)

feat(apigee): update the api
feat(dataflow): update the api
feat(dialogflow): update the api
feat(documentai): update the api
feat(healthcare): update the api

diff --git a/docs/dyn/dns_v1.managedZoneOperations.html b/docs/dyn/dns_v1.managedZoneOperations.html
index f1c3b99..16b7098 100644
--- a/docs/dyn/dns_v1.managedZoneOperations.html
+++ b/docs/dyn/dns_v1.managedZoneOperations.html
@@ -318,7 +318,7 @@
   "header": { # Elements common to every response.
     "operationId": "A String", # For mutating operation requests that completed successfully. This is the client_operation_id if the client specified it, otherwise it is generated by the server (output only).
   },
-  "kind": "dns#managedZoneOperationsListResponse", # Type of resource.
+  "kind": "dns#managedZoneOperationsListResponse",
   "nextPageToken": "A String", # The presence of this field indicates that there exist more results following your last page of results in pagination order. To fetch them, make another list request using this value as your page token. This lets you retrieve the complete contents of even very large collections one page at a time. However, if the contents of the collection change between the first and last paginated list request, the set of all elements returned are an inconsistent view of the collection. You cannot retrieve a consistent snapshot of a collection larger than the maximum page size.
   "operations": [ # The operation resources.
     { # An operation represents a successful mutation performed on a Cloud DNS resource. Operations provide: - An audit log of server resource mutations. - A way to recover/retry API calls in the case where the response is never received by the caller. Use the caller specified client_operation_id.