can-doc: Fixed a wrong filepath in can.txt

<linux/can/error.h> moved in the big UAPI shuffle; update the document to
note its new location.

Signed-off-by: Stefan Tatschner <stefan@sevenbyte.org>
[jc: added changelog]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/networking/can.txt b/Documentation/networking/can.txt
index 2236d6d..0a2859a 100644
--- a/Documentation/networking/can.txt
+++ b/Documentation/networking/can.txt
@@ -234,7 +234,7 @@
   mechanisms. Inside this filter definition the (interested) type of
   errors may be selected. The reception of error messages is disabled
   by default. The format of the CAN error message frame is briefly
-  described in the Linux header file "include/linux/can/error.h".
+  described in the Linux header file "include/uapi/linux/can/error.h".
 
 4. How to use SocketCAN
 ------------------------