Update browser-close-reasons.mdx

update since billing has started

Author: kathayl

src/content/docs/browser-rendering/platform/browser-close-reasons.mdx

@@ -18,6 +18,7 @@ To find the reason that a browser closed:
 2. Select the **Logs** tab.
 
 When Cloudflare begins charging for the Browser Rendering API, we will not charge when errors are due to underlying Browser Rendering infrastructure.
+Browser Rendering sessions are billed based on [usage](/browser-rendering/platform/pricing/). We do not charge for sessions that error due to underlying Browser Rendering infrastructure.
 
 | Reasons a session may end                            |
 | ---------------------------------------------------- |