Fixing documentation shotcomings

Signed-off-by: ormorph <roma251078@mail.ru>

README.md

@@ -58,7 +58,11 @@ Add all keywords from the ``` trinity.live.keywords ``` file to your setup, if y
 
 After that just run ``` emerge -av trinity-base/tdebase-meta ```, which should pull in all you need to end up with a slim TDE desktop, just like in good old Gentoo KDE3 days. If you need more, just look what the overlay offers at the moment and have fun.
 
-If you want to use TDM (KDM replacement of TDE), just don't forget to change ``` /etc/conf.d/xdm ``` to use ``` tdm ```.
+If you want to use TDM (KDM replacement of TDE), just don't forget to change ``` /etc/conf.d/display-manager ``` to use ``` tdm ```.
+Add display-manager to autoload:
+```
+# rc-config add display-manager
+```
 
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