Add info about retention (cloudflare#25318)

Author: angelampcosta

src/content/docs/log-explorer/index.mdx

@@ -20,6 +20,8 @@ Log Explorer provides access to Cloudflare logs with all the context available w
 - **Accelerated investigations with full context**: Investigate incidents with Cloudflare's unparalleled contextual data, accelerating your analysis and understanding of "What exactly happened?" and "How did it happen?"
 - **Minimal recovery time**: Seamlessly transition from investigation to action with direct mitigation capabilities via the Cloudflare platform.
 
+Contract customers can choose to store their logs in Log Explorer for up to two years, at an additional cost of $0.10 per GB per month. Customers interested in this feature can contact their account team to have it added to their contract.
+
 ## Features
 
 <Feature header="Log Search" href="/log-explorer/log-search/">