Update sample.ini

Use space to separate multiple modes

conf/sample.ini

@@ -272,7 +272,7 @@
 [log]
 # Either "console", "file", "syslog". Default is console and  file
 # Use space to separate multiple modes, e.g. "console file"
-;mode = console, file
+;mode = console file
 
 # Either "trace", "debug", "info", "warn", "error", "critical", default is "info"
 ;level = info