Update gathering-information-for-troubleshooting-sites.mdx (#18370)

Fix the link to docs on Troubleshooting CF HTTP errors 5xx.

Author: nenizera

src/content/docs/support/troubleshooting/general-troubleshooting/gathering-information-for-troubleshooting-sites.mdx

@@ -475,6 +475,6 @@ Cloudflare suggests [Wireshark](https://www.wireshark.org/download.html) for run
 ## Related resources
 
 - [Contacting Cloudflare Support](/support/contacting-cloudflare-support/)
-- [Troubleshooting Cloudflare HTTP 5XX errors](https://support.cloudflare.com/hc/articles/115003011431)
+- [Troubleshooting Cloudflare HTTP 5XX errors](/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors/)
 - [Diagnosing network issues with MTR and traceroute](https://www.cloudflare.com/en-gb/learning/network-layer/what-is-mtr/)
 - [cURL command line tool](https://curl.haxx.se/)