chore: regens API reference docs (#889)

diff --git a/docs/dyn/cloudbilling_v1.billingAccounts.projects.html b/docs/dyn/cloudbilling_v1.billingAccounts.projects.html
index 5214a37..bab5ec1 100644
--- a/docs/dyn/cloudbilling_v1.billingAccounts.projects.html
+++ b/docs/dyn/cloudbilling_v1.billingAccounts.projects.html
@@ -89,7 +89,7 @@
 [viewers](https://cloud.google.com/billing/docs/how-to/billing-access).
 
 Args:
-  name: string, The resource name of the billing account associated with the projects that
+  name: string, Required. The resource name of the billing account associated with the projects that
 you want to list. For example, `billingAccounts/012345-567890-ABCDEF`. (required)
   pageToken: string, A token identifying a page of results to be returned. This should be a
 `next_page_token` value returned from a previous `ListProjectBillingInfo`
@@ -116,16 +116,16 @@
         "projectId": "A String", # The ID of the project that this `ProjectBillingInfo` represents, such as
             # `tokyo-rain-123`. This is a convenience field so that you don't need to
             # parse the `name` field to obtain a project ID. This field is read-only.
-        "name": "A String", # The resource name for the `ProjectBillingInfo`; has the form
-            # `projects/{project_id}/billingInfo`. For example, the resource name for the
-            # billing information for project `tokyo-rain-123` would be
-            # `projects/tokyo-rain-123/billingInfo`. This field is read-only.
+        "billingAccountName": "A String", # The resource name of the billing account associated with the project, if
+            # any. For example, `billingAccounts/012345-567890-ABCDEF`.
         "billingEnabled": True or False, # True if the project is associated with an open billing account, to which
             # usage on the project is charged. False if the project is associated with a
             # closed billing account, or no billing account at all, and therefore cannot
             # use paid services. This field is read-only.
-        "billingAccountName": "A String", # The resource name of the billing account associated with the project, if
-            # any. For example, `billingAccounts/012345-567890-ABCDEF`.
+        "name": "A String", # The resource name for the `ProjectBillingInfo`; has the form
+            # `projects/{project_id}/billingInfo`. For example, the resource name for the
+            # billing information for project `tokyo-rain-123` would be
+            # `projects/tokyo-rain-123/billingInfo`. This field is read-only.
       },
     ],
   }</pre>