Add ability for X clibpard and Fenrir's clipboard to stay in sync.

docs/user.txt

@@ -1133,10 +1133,12 @@ Values: on=''True'', off=''False''
 Specify the path where the clipboard should be exported to.
 See [[#export clipboard to file|export clipboard to file]].
 The variable ''$user'' is replaced by the current logged username.
-  clipboardExportPath=/tmp/fenrirClipboard
+  [clipboard]
+  clipboard_export_path=/tmp/fenrirClipboard
 Values: Text, Systemfilepath
 
 The number of available clipboards:
+  [clipboard]
   number_of_clipboards=10
 Values: Integer, 1 - 999