Update frequently-asked-questions.mdx (cloudflare#21837)

added link to the methodologies page for the ddos reports.

Author: omer-cloudflare

src/content/docs/ddos-protection/frequently-asked-questions.mdx

@@ -88,6 +88,8 @@ Yes. Using our anycast network, along with Traffic Manager, Unimog, and Plurimog
 
 Cloudflare publishes quarterly DDoS reports and coverage of signficant DDoS attacks. The publications are available on our [blog website](https://blog.cloudflare.com/tag/ddos-reports/) and as interactive reports on the [Cloudflare Radar Reports website](https://radar.cloudflare.com/reports?q=DDoS). 
 
+Learn more about the [methodologies](/radar/reference/quarterly-ddos-reports/) behind these reports.
+
 You can also view [Cloudflare Radar](https://radar.cloudflare.com/) for near real-time insights and trends.
 
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