Add redirect precedence to block page

Author: maxvp

src/content/docs/cloudflare-one/policies/gateway/block-page.mdx

@@ -47,6 +47,14 @@ Gateway will now redirect users to a custom page when user traffic matches a Blo
 
 <Render file="gateway/policy-context" />
 
+#### Redirect precedence
+
+Paths and queries in the redirect URL take precedence over the original URL. When you turn on **Send policy context**, Gateway will always append context to the end of the redirected URL. For example, if the original URL is `example.com/path/to/page?querystring=X&k=1` and the redirect URL is `cloudflare.com/redirect-path?querystring=Y`, Gateway will redirect requests to:
+
+```txt ins="&[email protected]"
+cloudflare.com/redirect-path?querystring=Y&[email protected]
+```
+
 ### Customize the block page
 
 <Render file="gateway/customize-block-page" />