chore: regens API reference docs (#889)

diff --git a/docs/dyn/alertcenter_v1beta1.v1beta1.html b/docs/dyn/alertcenter_v1beta1.v1beta1.html
index a4246f4..647d809 100644
--- a/docs/dyn/alertcenter_v1beta1.v1beta1.html
+++ b/docs/dyn/alertcenter_v1beta1.v1beta1.html
@@ -78,7 +78,7 @@
   <code><a href="#getSettings">getSettings(customerId=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Returns customer-level settings.</p>
 <p class="toc_element">
-  <code><a href="#updateSettings">updateSettings(body, customerId=None, x__xgafv=None)</a></code></p>
+  <code><a href="#updateSettings">updateSettings(body=None, customerId=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Updates the customer-level settings.</p>
 <h3>Method Details</h3>
 <div class="method">
@@ -118,11 +118,11 @@
 </div>
 
 <div class="method">
-    <code class="details" id="updateSettings">updateSettings(body, customerId=None, x__xgafv=None)</code>
+    <code class="details" id="updateSettings">updateSettings(body=None, customerId=None, x__xgafv=None)</code>
   <pre>Updates the customer-level settings.
 
 Args:
-  body: object, The request body. (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # Customer-level settings.