[Errors] Update error-500.mdx (#24176)

* [Errors] Update error-500.mdx

SPM-2107

* Update src/content/docs/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-500.mdx

---------

Co-authored-by: Rebecca Tamachiro <[email protected]>

Author: ngayerie

src/content/docs/support/troubleshooting/http-status-codes/cloudflare-5xx-errors/error-500.mdx

@@ -25,4 +25,8 @@ However, if the `500` error contains `cloudflare` or `cloudflare-nginx` in the H
 :::note
 
 If you observe blank or white pages when visiting your website, confirm whether the issue occurs when [temporarily pausing Cloudflare](/fundamentals/manage-domains/pause-cloudflare/) and contact your hosting provider for assistance.
-:::
+:::
+
+### Known Cloudflare issue leading to HTTP Error 500
+
+- A configuration issue on Page Rules can generate HTTP Error `500`. Refer to [Page Rules troubleshooting](/rules/page-rules/troubleshooting/general/#error-500-internal-server-error) for more details and resolution.