Automator: update istio.io@ reference docs (#16512)

Author: istio-testing

content/en/docs/reference/config/security/request_authentication/index.html

@@ -297,7 +297,6 @@ <h2 id="JWTRule">JWTRule</h2>
 <tr id="JWTRule-issuer">
 <td><div class="field"><div class="name"><code><a href="#JWTRule-issuer">issuer</a></code></div>
 <div class="type">string</div>
-<div class="required">Required</div>
 </div></td>
 <td>
 <p>Identifies the issuer that issued the JWT. See

content/zh/docs/reference/config/security/request_authentication/index.html

@@ -297,7 +297,6 @@ <h2 id="JWTRule">JWTRule</h2>
 <tr id="JWTRule-issuer">
 <td><div class="field"><div class="name"><code><a href="#JWTRule-issuer">issuer</a></code></div>
 <div class="type">string</div>
-<div class="required">Required</div>
 </div></td>
 <td>
 <p>Identifies the issuer that issued the JWT. See