Fix job timeout docs

The unit for the job timeout is actually seconds.

Change-Id: I3482a59907184e78c552c7c6fe6fa39a6dfc5e04
diff --git a/doc/source/user/config.rst b/doc/source/user/config.rst
index cad2167..973470d 100644
--- a/doc/source/user/config.rst
+++ b/doc/source/user/config.rst
@@ -755,7 +755,7 @@
 
    .. attr:: timeout
 
-      The time in minutes that the job should be allowed to run before
+      The time in seconds that the job should be allowed to run before
       it is automatically aborted and failure is reported.  If no
       timeout is supplied, the job may run indefinitely.  Supplying a
       timeout is highly recommended.