docs: Update the CN translation for esp_crt_bundle.rst

Author: shenmengjing

docs/en/api-reference/protocols/esp_crt_bundle.rst

@@ -87,28 +87,26 @@ Cross-Signed Certificate Support
 Overview
 ^^^^^^^^
 
-When the configuration option :ref:`CONFIG_MBEDTLS_CERTIFICATE_BUNDLE_CROSS_SIGNED_VERIFY` is enabled,
-the ESP x509 Certificate Bundle API adds support for verifying certificate chains that include cross-signed root certificates.
-This feature allows the verification process to dynamically select candidate Certificate Authorities (CAs) from the bundle,
-even when the certificate chain contains cross-signed roots, improving interoperability with a wider range of server certificates.
+When the configuration option :ref:`CONFIG_MBEDTLS_CERTIFICATE_BUNDLE_CROSS_SIGNED_VERIFY` is enabled, the ESP x509 Certificate Bundle API adds support for verifying certificate chains that include cross-signed root certificates.
 
-With this functionality enabled, certificate verification is performed in a manner equivalent to the default mbedTLS behaviour,
-ensuring compatibility and robust validation for cross-signed chains.
+This feature allows the verification process to dynamically select candidate Certificate Authorities (CAs) from the bundle, even when the certificate chain contains cross-signed roots, improving interoperability with a wider range of server certificates.
+
+With this functionality enabled, certificate verification is performed in a manner equivalent to the default mbedTLS behavior, ensuring compatibility and robust validation for cross-signed chains.
 
 .. note::
 
-    Enabling cross-signed certificate support increases run-time heap utilisation by approximately 700 bytes, but reduces the flash footprint as the bundle size is reduced.
+    Enabling cross-signed certificate support increases run-time heap utilization by approximately 700 bytes, but reduces the flash footprint as the bundle size is reduced.
 
 Key Points:
+
 - The bundle can act as a dynamic CA store, providing candidate root certificates during the handshake.
 - The verification callback uses the issuer information from the certificate chain to locate and provide matching root certificates from the bundle.
 - This is especially useful for environments where cross-signing is common, such as during root CA transitions.
 
 Usage
 ^^^^^
 
-No additional application changes are required beyond enabling :ref:`CONFIG_MBEDTLS_CERTIFICATE_BUNDLE_CROSS_SIGNED_VERIFY` in your project configuration.
-The bundle will automatically provide candidate CAs during the TLS handshake.
+No additional application changes are required beyond enabling :ref:`CONFIG_MBEDTLS_CERTIFICATE_BUNDLE_CROSS_SIGNED_VERIFY` in your project configuration. The bundle will automatically provide candidate CAs during the TLS handshake.
 
 .. note::
 

docs/zh_CN/api-reference/protocols/esp_crt_bundle.rst

@@ -81,6 +81,37 @@ ESP x509 证书包 API 提供了一种简便的方法，帮助你安装自定义
 
 证书包会与 Mozilla 的 NSS 根证书商店定期同步。在 ESP-IDF 的次要版本或补丁版本中，为了保证兼容性，会将上游证书包中已弃用的证书添加到弃用列表。如有需要，可以通过 :ref:`CONFIG_MBEDTLS_CERTIFICATE_BUNDLE_DEPRECATED_LIST` 将弃用证书加入默认证书包。这些弃用证书将在下一个 ESP-IDF 主要版本中移除。
 
+交叉签名证书支持
+----------------
+
+概述
+^^^^
+
+启用配置选项 :ref:`CONFIG_MBEDTLS_CERTIFICATE_BUNDLE_CROSS_SIGNED_VERIFY` 时，ESP x509 证书包 API 将支持验证包含交叉签名根证书的证书链。
+
+即使证书链中包含交叉签名根证书，验证过程中也能从证书包中智能匹配候选的证书颁发机构 (CA)，从而提高与各类服务器证书的互操作性。
+
+启用该功能后，证书验证逻辑与默认的 mbedTLS 行为一致，能够确保与交叉签名证书链兼容，且验证过程稳健可靠。
+
+.. note::
+
+    启用交叉签名证书支持功能后，运行时的堆内存使用量将增加约 700 字节，但由于证书包体积减小，flash 占用会降低。
+
+关键点：
+
+- 证书包可作为动态 CA 存储，在握手过程中提供候选的根证书；
+- 验证回调函数会使用证书链中的颁发者信息，从证书包中定位并提供匹配的根证书；
+- 该功能在交叉签名较为常见的场景中能够提供帮助，例如根 CA 切换期间。
+
+使用方法
+^^^^^^^^
+
+除了在项目配置中启用 :ref:`CONFIG_MBEDTLS_CERTIFICATE_BUNDLE_CROSS_SIGNED_VERIFY` 外，应用无需额外更改。握手过程中，证书包会自动提供候选的 CA。
+
+.. note::
+
+    如果启用了 :ref:`CONFIG_MBEDTLS_CERTIFICATE_BUNDLE_CROSS_SIGNED_VERIFY`，其内部会使用 ``MBEDTLS_X509_TRUSTED_CERT_CALLBACK``。在此情况下，用户 **不应** 自行提供受信任证书回调函数，因为证书包会自动处理。
+
 应用示例
 ---------