Update content/docs/reference/routes/public-access.mdx

Co-authored-by: Kenneth Jenkins <[email protected]>

Author: ZPain8464

content/docs/reference/routes/public-access.mdx

@@ -33,7 +33,7 @@ User-agent: *
 Disallow: /
 ```
 
-For routes with `allow_public_unauthenticated_access` enabled, Pomerium does not overwrite the contents of the **robots.txt** file.
+For routes with `allow_public_unauthenticated_access` enabled, Pomerium will not serve **robots.txt** directly. Instead, requests for `/robots.txt` will be proxied to the upstream service.
 
 ## How to configure