Input: joystick - refer to /dev/input/js0 in documentation

Nowadays the joystick device nodes are created under /dev/input, reflect
this in the documentation in order to make copy and paste easier for
users.

Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
diff --git a/Documentation/input/joystick-api.txt b/Documentation/input/joystick-api.txt
index c507330..f95f648 100644
--- a/Documentation/input/joystick-api.txt
+++ b/Documentation/input/joystick-api.txt
@@ -16,7 +16,7 @@
 
 By default, the device is opened in blocking mode.
 
-	int fd = open ("/dev/js0", O_RDONLY);
+	int fd = open ("/dev/input/js0", O_RDONLY);
 
 
 2. Event Reading