chore: regens API reference docs (#889)

diff --git a/docs/dyn/sqladmin_v1beta4.tiers.html b/docs/dyn/sqladmin_v1beta4.tiers.html
index 206539b..ad2d311 100644
--- a/docs/dyn/sqladmin_v1beta4.tiers.html
+++ b/docs/dyn/sqladmin_v1beta4.tiers.html
@@ -75,15 +75,21 @@
 <h1><a href="sqladmin_v1beta4.html">Cloud SQL Admin API</a> . <a href="sqladmin_v1beta4.tiers.html">tiers</a></h1>
 <h2>Instance Methods</h2>
 <p class="toc_element">
-  <code><a href="#list">list(project)</a></code></p>
-<p class="firstline">Lists all available machine types (tiers) for Cloud SQL, for example, db-n1-standard-1. For related information, see Pricing.</p>
+  <code><a href="#list">list(project, x__xgafv=None)</a></code></p>
+<p class="firstline">Lists all available machine types (tiers) for Cloud SQL, for example,</p>
 <h3>Method Details</h3>
 <div class="method">
-    <code class="details" id="list">list(project)</code>
-  <pre>Lists all available machine types (tiers) for Cloud SQL, for example, db-n1-standard-1. For related information, see Pricing.
+    <code class="details" id="list">list(project, x__xgafv=None)</code>
+  <pre>Lists all available machine types (tiers) for Cloud SQL, for example,
+db-n1-standard-1. For related information, see &lt;a
+href="/sql/pricing"&gt;Pricing&lt;/a&gt;.
 
 Args:
   project: string, Project ID of the project for which to list tiers. (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
 
 Returns:
   An object of the form:
@@ -91,16 +97,17 @@
     { # Tiers list response.
     "items": [ # List of tiers.
       { # A Google Cloud SQL service tier resource.
+        "tier": "A String", # An identifier for the machine type, for example, db-n1-standard-1. For
+            # related information, see &lt;a href="/sql/pricing"&gt;Pricing&lt;/a&gt;.
         "DiskQuota": "A String", # The maximum disk size of this tier in bytes.
-        "tier": "A String", # An identifier for the machine type, for example, db-n1-standard-1. For related information, see Pricing.
-        "kind": "sql#tier", # This is always sql#tier.
-        "RAM": "A String", # The maximum RAM usage of this tier in bytes.
         "region": [ # The applicable regions for this tier.
           "A String",
         ],
+        "RAM": "A String", # The maximum RAM usage of this tier in bytes.
+        "kind": "A String", # This is always &lt;code&gt;sql#tier&lt;/code&gt;.
       },
     ],
-    "kind": "sql#tiersList", # This is always sql#tiersList.
+    "kind": "A String", # This is always &lt;code&gt;sql#tiersList&lt;/code&gt;.
   }</pre>
 </div>