Update installation.md

docs/guide/installation.md

@@ -117,7 +117,10 @@ server {
             set $fsn $fastcgi_script_name;
         }
 
+        #for php-cgi
         fastcgi_pass   127.0.0.1:9000;
+        #for php-fpm
+        #fastcgi_pass unix:/var/run/php5-fpm.sock;
         include fastcgi_params;
         fastcgi_param  SCRIPT_FILENAME  $document_root$fsn;