Typo in docs.xfce.org

[Masato Hashimoto]

Hi,

There is a typo in http://docs.xfce.org/xfce/xfce4-session/advanced.
(due to the docwiki syntax).

> In 4.10, start Xfce with startxfce4 –with-ck-launch. This will start 
> xfce4-session with ck-launch-session. In 4.10, Xfce4-sesion will take 
> care of the dbus-session launch.

'--' is replaced with '–' in '--with-ck-launch'.

Thx
-- 
HASHIMOTO, Masato