Update sample-nginx.config

Added buffers and buffer size

mods/sample-nginx.config

@@ -127,6 +127,9 @@ server {
     include fastcgi_params;
     fastcgi_index index.php;
     fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
+		
+		fastcgi_buffers 16 16k; 
+    fastcgi_buffer_size 32k;
   }
 
   # block these file types