Remove useless command

Combination of group removal, reformat and \n removal get rid of useless comments.

Guides/ics-vim.md

@@ -10,10 +10,6 @@ Tips to modify an autogenerated ics file with the Vim text editor.
 
 `%s/\n - DESCRIPTION : \(.*\)$/\1/`
 
-## Remove useless description
-
-Vim command : `:%s/^ - DESCRIPTION : \n//`
-
 ## Remove unescaped \n
 
 Vim command : `:%s/\\n//g`