chore: regens API reference docs (#889)

diff --git a/docs/dyn/adexchangebuyer2_v2beta1.accounts.clients.users.html b/docs/dyn/adexchangebuyer2_v2beta1.accounts.clients.users.html
index f1dd5f0..8ab9042 100644
--- a/docs/dyn/adexchangebuyer2_v2beta1.accounts.clients.users.html
+++ b/docs/dyn/adexchangebuyer2_v2beta1.accounts.clients.users.html
@@ -84,7 +84,7 @@
   <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
 <p class="firstline">Retrieves the next page of results.</p>
 <p class="toc_element">
-  <code><a href="#update">update(accountId, clientAccountId, userId, body, x__xgafv=None)</a></code></p>
+  <code><a href="#update">update(accountId, clientAccountId, userId, body=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Updates an existing client user.</p>
 <h3>Method Details</h3>
 <div class="method">
@@ -207,7 +207,7 @@
 </div>
 
 <div class="method">
-    <code class="details" id="update">update(accountId, clientAccountId, userId, body, x__xgafv=None)</code>
+    <code class="details" id="update">update(accountId, clientAccountId, userId, body=None, x__xgafv=None)</code>
   <pre>Updates an existing client user.
 Only the user status can be changed on update.
 
@@ -216,7 +216,7 @@
   clientAccountId: string, Numerical account ID of the client buyer that the user to be retrieved
 is associated with. (required) (required)
   userId: string, Numerical identifier of the user to retrieve. (required) (required)
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # A client user is created under a client buyer and has restricted access to