IB: Fix typo in udev rule documentation

The proper syntax for udev rules is KERNEL==... instead of KERNEL=...

Signed-off-by: Bart Van Assche <bart.vanassche@gmail.com>
Reported-by: Lukasz Jurewicz <lukasz.jurewicz@gmail.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/Documentation/infiniband/user_verbs.txt b/Documentation/infiniband/user_verbs.txt
index f847501..afe3f8d 100644
--- a/Documentation/infiniband/user_verbs.txt
+++ b/Documentation/infiniband/user_verbs.txt
@@ -58,7 +58,7 @@
   To create the appropriate character device files automatically with
   udev, a rule like
 
-    KERNEL="uverbs*", NAME="infiniband/%k"
+    KERNEL=="uverbs*", NAME="infiniband/%k"
 
   can be used.  This will create device nodes named