remove mentionings of devfs in documentation

Now that devfs is removed, there's no longer any need to document how to
do this or that with devfs.

This patch includes some improvements by Joe Perches.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/Documentation/input/joystick.txt b/Documentation/input/joystick.txt
index 841c353..389de9b 100644
--- a/Documentation/input/joystick.txt
+++ b/Documentation/input/joystick.txt
@@ -60,7 +60,7 @@
 
 2.2 Device nodes
 ~~~~~~~~~~~~~~~~
-For applications to be able to use the joysticks, in you don't use devfs,
+For applications to be able to use the joysticks,
 you'll have to manually create these nodes in /dev:
 
 cd /dev