chore: regens API reference docs (#889)

diff --git a/docs/dyn/firebasehosting_v1beta1.sites.html b/docs/dyn/firebasehosting_v1beta1.sites.html
index 1e22443..2587ac4 100644
--- a/docs/dyn/firebasehosting_v1beta1.sites.html
+++ b/docs/dyn/firebasehosting_v1beta1.sites.html
@@ -75,6 +75,11 @@
 <h1><a href="firebasehosting_v1beta1.html">Firebase Hosting API</a> . <a href="firebasehosting_v1beta1.sites.html">sites</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
+  <code><a href="firebasehosting_v1beta1.sites.channels.html">channels()</a></code>
+</p>
+<p class="firstline">Returns the channels Resource.</p>
+
+<p class="toc_element">
   <code><a href="firebasehosting_v1beta1.sites.domains.html">domains()</a></code>
 </p>
 <p class="firstline">Returns the domains Resource.</p>
@@ -93,7 +98,7 @@
   <code><a href="#getConfig">getConfig(name, x__xgafv=None)</a></code></p>
 <p class="firstline">Gets the Hosting metadata for a specific site.</p>
 <p class="toc_element">
-  <code><a href="#updateConfig">updateConfig(name, body, updateMask=None, x__xgafv=None)</a></code></p>
+  <code><a href="#updateConfig">updateConfig(name, body=None, updateMask=None, x__xgafv=None)</a></code></p>
 <p class="firstline">Sets the Hosting metadata for a specific site.</p>
 <h3>Method Details</h3>
 <div class="method">
@@ -102,7 +107,7 @@
 
 Args:
   name: string, Required. The site for which to get the SiteConfig, in the format:
-<code>sites/<var>site-name</var>/config</code> (required)
+&lt;code&gt;sites/&lt;var&gt;site-name&lt;/var&gt;/config&lt;/code&gt; (required)
   x__xgafv: string, V1 error format.
     Allowed values
       1 - v1 error format
@@ -122,13 +127,13 @@
 </div>
 
 <div class="method">
-    <code class="details" id="updateConfig">updateConfig(name, body, updateMask=None, x__xgafv=None)</code>
+    <code class="details" id="updateConfig">updateConfig(name, body=None, updateMask=None, x__xgafv=None)</code>
   <pre>Sets the Hosting metadata for a specific site.
 
 Args:
   name: string, Required. The site for which to update the SiteConfig, in the format:
-<code>sites/<var>site-name</var>/config</code> (required)
-  body: object, The request body. (required)
+&lt;code&gt;sites/&lt;var&gt;site-name&lt;/var&gt;/config&lt;/code&gt; (required)
+  body: object, The request body.
     The object takes the form of:
 
 { # A `SiteConfig` contains metadata associated with a specific site that
@@ -142,8 +147,8 @@
 
   updateMask: string, A set of field names from your [site configuration](../sites.SiteConfig)
 that you want to update.
-<br>A field will be overwritten if, and only if, it's in the mask.
-<br>If a mask is not provided then a default mask of only
+&lt;br&gt;A field will be overwritten if, and only if, it's in the mask.
+&lt;br&gt;If a mask is not provided then a default mask of only
 [`max_versions`](../sites.SiteConfig.max_versions) will be used.
   x__xgafv: string, V1 error format.
     Allowed values