docs: docs update (#911)

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Fixes #<issue_number_goes_here> 🦕
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+<html><body>
+<style>
+
+body, h1, h2, h3, div, span, p, pre, a {
+  margin: 0;
+  padding: 0;
+  border: 0;
+  font-weight: inherit;
+  font-style: inherit;
+  font-size: 100%;
+  font-family: inherit;
+  vertical-align: baseline;
+}
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+body {
+  font-size: 13px;
+  padding: 1em;
+}
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+h1 {
+  font-size: 26px;
+  margin-bottom: 1em;
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+h2 {
+  font-size: 24px;
+  margin-bottom: 1em;
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+h3 {
+  font-size: 20px;
+  margin-bottom: 1em;
+  margin-top: 1em;
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+pre, code {
+  line-height: 1.5;
+  font-family: Monaco, 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Lucida Console', monospace;
+}
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+pre {
+  margin-top: 0.5em;
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+  font-family: Arial, sans serif;
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+h1, h2, h3 {
+  border-bottom: solid #CCC 1px;
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+.toc_element {
+  margin-top: 0.5em;
+}
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+.firstline {
+  margin-left: 2 em;
+}
+
+.method  {
+  margin-top: 1em;
+  border: solid 1px #CCC;
+  padding: 1em;
+  background: #EEE;
+}
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+.details {
+  font-weight: bold;
+  font-size: 14px;
+}
+
+</style>
+
+<h1><a href="sql_v1beta4.html">Cloud SQL Admin API</a> . <a href="sql_v1beta4.tiers.html">tiers</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <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, 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=&quot;/sql/pricing&quot;&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:
+
+    { # Tiers list response.
+    &quot;kind&quot;: &quot;A String&quot;, # This is always &lt;code&gt;sql#tiersList&lt;/code&gt;.
+    &quot;items&quot;: [ # List of tiers.
+      { # A Google Cloud SQL service tier resource.
+        &quot;RAM&quot;: &quot;A String&quot;, # The maximum RAM usage of this tier in bytes.
+        &quot;region&quot;: [ # The applicable regions for this tier.
+          &quot;A String&quot;,
+        ],
+        &quot;tier&quot;: &quot;A String&quot;, # An identifier for the machine type, for example, db-n1-standard-1. For
+            # related information, see &lt;a href=&quot;/sql/pricing&quot;&gt;Pricing&lt;/a&gt;.
+        &quot;DiskQuota&quot;: &quot;A String&quot;, # The maximum disk size of this tier in bytes.
+        &quot;kind&quot;: &quot;A String&quot;, # This is always &lt;code&gt;sql#tier&lt;/code&gt;.
+      },
+    ],
+  }</pre>
+</div>
+
+</body></html>
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