Add responsibility disclaimer note to pqc-support

Author: RebeccaTamachiro

src/content/docs/ssl/post-quantum-cryptography/pqc-support.mdx

@@ -9,6 +9,10 @@ description: Consider information about post-quantum cryptography at Cloudflare
 
 Cloudflare's deployment of post-quantum [hybrid key agreements](/ssl/post-quantum-cryptography/#hybrid-key-agreement) is supported by different software as listed below. [Contributions](https://github.com/cloudflare/cloudflare-docs/blob/production/CONTRIBUTING.md) to keep the listing up-to-date are welcome!
 
+:::caution
+The list below is for reference only. Responsibility for third-party software lies with their respective maintainers. Use them at your own discretion.
+:::
+
 ## X25519MLKEM768
 - Default for [Firefox 132+](https://www.mozilla.org/firefox/channel/desktop/) (Beta)
 - Default for [Chrome 131+](https://www.google.com/chrome/beta/) (Beta)