Update contacting-cloudflare-support.mdx (#20087)

Troubleshoot or debug customer's code and its logic is beyond the scope of our technical support team.

Author: nenizera

src/content/docs/support/contacting-cloudflare-support.mdx

@@ -12,6 +12,7 @@ Cloudflare Support _cannot_ perform the following actions:
 
 - Make configuration or account changes on a customer’s behalf
 - Provide sensitive account info over the phone
+- Troubleshoot or debug customer's code and its logic
 - Troubleshoot or answer questions about domains not associated with the Cloudflare account email address used to contact support
 
 :::caution