refactor: update comment for favicon logging suppression in nginx config

Author: Akhileswara-Microsoft

src/ContentProcessorWeb/nginx-custom.conf

@@ -2,11 +2,10 @@ server {
     listen 80;
     server_name localhost;
 
-    # Prevent favicon requests from being logged in network logs
+    # Suppress nginx server logs for favicon requests
     location = /favicon.ico {
         return 204;
         access_log off;
-        log_not_found off;
     }
 
     location / {