README: Move autotools comment away from introduction

The comment is more about how to build the software, not so much about
what the purpose of the software is. As such I don't think it's worthy
of being part of the introduction.

Change-Id: Iacabd12f89fe569ea11af9d1d66ab1d6f0c7beef
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/README.md b/README.md
index 1d32eb7..3dd229a 100644
--- a/README.md
+++ b/README.md
@@ -13,8 +13,6 @@
 limitations under the License.
 
 # Intro
-The autotools of this requires the autoconf-archive package for your
-system
 
 This is a protocol description using the mailbox registers on
 Aspeed 2400/2500 chips for host to BMC communication. The mailbox
@@ -62,6 +60,10 @@
 performing the necessary action the host should send a BMC_EVENT_ACK
 message to the BMC with which bit it has actioned.
 
+### Building
+The autotools of this requires the autoconf-archive package for your
+system
+
 ---
 
 ## Layout