Update kentik.mdx (cloudflare#26195)

Updated Link that 404's to https://kb.kentik.com/v1/docs/mitigation-overview#cloudflare-mt-setup based on Kentik's PMs outreach to me.

Author: mbullock1986

src/content/docs/magic-transit/partners/kentik.mdx

@@ -43,7 +43,7 @@ You will need the email address associated with your Cloudflare account, Cloudfl
 
 10. From **Options** > **Time**, you can edit the **Lookback** information to review traffic source information for a specific time period.
 
-For additional information about Kentik and Magic Transit, refer to [Kentik's Magic Transit setup](https://kb.kentik.com/v3/Gc10.htm#Gc10-Cloudflare_MT_Setup).
+For additional information about Kentik and Magic Transit, refer to [Kentik's Magic Transit setup](https://kb.kentik.com/v1/docs/mitigation-overview#cloudflare-mt-setup).
 
 ## Access Cloudflare account