Fix header in ipmi-architecture.md

A bolded header doesn't do anything.

Change-Id: I14422b81d511141e1ee82272a42f6ec674797ffa
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/ipmi-architecture.md b/ipmi-architecture.md
index fa33bcb..13960ee 100644
--- a/ipmi-architecture.md
+++ b/ipmi-architecture.md
@@ -66,7 +66,7 @@
 to add IPMI commands.
 
 
-## **Details and Implementation**
+## Details and Implementation
 
 For session-less channels (like BT, KCS, and IPMB), the only privilege check
 will be to see that the requested privilege is less than or equal to the