update docs

Author: henderkes

docs/en/guide/extension-notes.md

@@ -6,6 +6,8 @@ which will be listed one by one here.
 
 ## curl
 
+HTTP3 support is not enabled by default, compile with `--with-libs="nghttp2,nghttp3,ngtcp2"` to enable HTTP3 support for PHP >= 8.4.
+
 When using curl to request HTTPS, there may be an `error:80000002:system library::No such file or directory` error.
 For details on the solution, see [FAQ - Unable to use ssl](../faq/#unable-to-use-ssl).
 
@@ -156,4 +158,4 @@ Parallel is only supported on PHP 8.0 ZTS and above.
 
 1. This is not technically an extension, but a library.
 2. Building with `--with-libs="mimalloc"` on Linux or macOS will override the default allocator.
-3. This is experimental for now, but is recommended in threaded environments.
+3. This is experimental for now, but is recommended in threaded environments.

docs/zh/guide/extension-notes.md

@@ -4,6 +4,8 @@
 
 ## curl
 
+HTTP3 支持默认未启用，需在编译时添加 `--with-libs="nghttp2,nghttp3,ngtcp2"` 以启用 PHP 8.4 及以上版本的 HTTP3 支持。
+
 使用 curl 请求 HTTPS 时，可能存在 `error:80000002:system library::No such file or directory` 错误，
 解决办法详见 [FAQ - 无法使用 ssl](../faq/#无法使用-ssl)。