Automator: update istio.io@ reference docs (#16733)

Author: istio-testing

content/en/docs/reference/config/networking/gateway/index.html

@@ -513,6 +513,16 @@ <h2 id="ServerTLSSettings">ServerTLSSettings</h2>
 <p>Same as CredentialName but for multiple certificates. Mainly used for specifying
 RSA and ECDSA certificates for the same server.</p>
 
+</td>
+</tr>
+<tr id="ServerTLSSettings-ca_cert_credential_name">
+<td><div class="field"><div class="name"><code><a href="#ServerTLSSettings-ca_cert_credential_name">caCertCredentialName</a></code></div>
+<div class="type">string</div>
+</div></td>
+<td>
+<p>For mutual TLS, the name of the secret or the configmap that holds CA certificates.
+Takes precedence over CA certificates in the Secret referenced with <code>credentialName(s)</code>.</p>
+
 </td>
 </tr>
 <tr id="ServerTLSSettings-tls_certificates">

content/zh/docs/reference/config/networking/gateway/index.html

@@ -513,6 +513,16 @@ <h2 id="ServerTLSSettings">ServerTLSSettings</h2>
 <p>Same as CredentialName but for multiple certificates. Mainly used for specifying
 RSA and ECDSA certificates for the same server.</p>
 
+</td>
+</tr>
+<tr id="ServerTLSSettings-ca_cert_credential_name">
+<td><div class="field"><div class="name"><code><a href="#ServerTLSSettings-ca_cert_credential_name">caCertCredentialName</a></code></div>
+<div class="type">string</div>
+</div></td>
+<td>
+<p>For mutual TLS, the name of the secret or the configmap that holds CA certificates.
+Takes precedence over CA certificates in the Secret referenced with <code>credentialName(s)</code>.</p>
+
 </td>
 </tr>
 <tr id="ServerTLSSettings-tls_certificates">