mctp: fix a hyperlink

The original syntax is wrong. It should be [DisplayText](link).

Signed-off-by: Nan Zhou <nanzhoumails@gmail.com>
Change-Id: Ice0304b29785de3efa09497a63de0d3cb91ec3da
diff --git a/designs/mctp/mctp-userspace.md b/designs/mctp/mctp-userspace.md
index c21e95a..0eaeccc 100644
--- a/designs/mctp/mctp-userspace.md
+++ b/designs/mctp/mctp-userspace.md
@@ -2,7 +2,7 @@
 
 Author: Jeremy Kerr <jk@ozlabs.org> <jk>
 
-Please refer to the [mctp.md](MCTP Overview) document for general
+Please refer to the [MCTP Overview](mctp.md) document for general
 MCTP design description, background and requirements.
 
 This document describes a userspace implementation of MCTP