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

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

Author: ZPain8464

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

@@ -26,7 +26,7 @@ Because the **Public Access** setting bypasses authentication and authorization
 
 ### Robots.txt behavior
 
-By default, Pomerium serves a custom **robots.txt** file that instructs user-agents _not_ to crawl a given route:
+By default, Pomerium serves a **robots.txt** response directly, instructing search engines _not_ to crawl the route domain:
 
 ```txt
 User-agent: *