update config page

content/config/_index.md

@@ -8,7 +8,7 @@ description: >
 This is the section on the config file.
 
 To use a specific file:
-```backy backup -f /path/to/file```
+```backy [command] -f /path/to/file```
 
 If you leave the config path blank, the following paths will be searched in order: